Document:

EMPLOYMENT AND
                           CHANGE IN CONTROL AGREEMENT

     Agreement, made as of the 5th day of May 2000, by and between Arch Capital
Group Ltd., a Delaware corporation (the "Company"), and Louis T. Petrillo (the
"Executive").

     WHEREAS, the Executive is a key employee of the Company or one of its
subsidiaries; and

     WHEREAS, the Board of Directors of the Company (the "Board") considers the
maintenance of a sound management to be essential to protecting and enhancing
the best interests of the Company and its stockholders and recognizes that the
possibility of a change in control raises uncertainty and questions among key
employees and may result in the departure or distraction of such key employees
to the detriment of the Company and its stockholders; and

     WHEREAS, the Board wishes to assure that it will have the continued
dedication of the Executive and the availability of his advice and counsel
notwithstanding the possibility, threat or occurrence of a bid to take over
control of the Company, and to induce the Executive to remain in the employ of
the Company; and

     WHEREAS, the Executive is willing to continue to serve the Company or one
of its subsidiaries taking into account the provisions of this Agreement;

     NOW, THEREFORE, in consideration of the foregoing, and the respective
covenants and agreements of the parties herein contained, the parties agree as
follows:

     1. Position & Responsibilities: The Company employs the Executive to serve
as Senior Vice President, General Counsel and Secretary of the Company, and in
such capacity the Executive shall report to the President of the Company, and
the Executive shall accept said employment. The term of the Executive's
employment shall terminate upon notice by either the Company to the Executive or
by you to the Company.

     2. Compensation: Compensation for the Executive's services shall be at an
annual base salary rate of $180,000 (subject to upward adjustments by the Board)
and an annual bonus to be determined by the Board. The target rate for the
annual bonus is 40% of the base rate salary. All awards of annual bonuses are
subject to approval by the Board.

     3. Additional Terms: The Executive is eligible to participate in the
Company's 1995 and 1999 Long Term Incentive and Share Award Plans under which
annual awards of options and/or other stock-based awards may be granted by the
Board or its duly authorized committee. The Executive is also eligible to
participate in employee benefit programs of the Company as are in effect from
time to time.

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                                       2

     4. Definitions.

     (i) "Change in Control" means any of the following occurring after the date
hereof:

          (A) any person (within the meaning of the Securities Exchange Act of
     1934, as amended (the "Exchange Act")), other than a Permitted Person or an
     Initial Investor, is or becomes the "beneficial owner" (as defined in Rule
     13d-3 under the Exchange Act), directly or indirectly, of Voting Securities
     representing 35% or more of the total voting power of all the then
     outstanding Voting Securities; or

          (B) any Initial Investor is or becomes the "beneficial owner" (as
     defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of
     Voting Securities representing 50% or more of the total voting power of all
     the then outstanding Voting Securities; or

          (C) the individuals who, as of the date hereof, constitute the Board
     together with those who become directors subsequent to such date and whose
     recommendation, election or nomination for election to the Board was
     approved by a vote of at least a majority of the directors then still in
     office who either were directors as of such date or whose recommendation,
     election or nomination for election was previously so approved, cease for
     any reason to constitute a majority of the members of the Board; or

          (D) the consummation of a merger, consolidation, recapitalization,
     liquidation, sale or disposition by the Company of all or substantially all
     of the Company's assets, or reorganization of the Company, other than any
     such transaction which would (x) result in at least 60% of the total voting
     power represented by the voting securities of the surviving entity or, in
     the case of an asset sale, the successor entity, outstanding immediately
     after such transaction being beneficially owned, directly or indirectly, by
     the stockholders of the Company immediately preceding the transaction and
     (y) not otherwise be deemed a Change in Control under clause (A), (B), (C)
     or (E) of this subsection (i); or

          (E) the Board adopts a resolution to the effect that, for purposes
     hereof, a Change in Control has occurred.

     (ii) "Change in Control Date" means any date during the term of this
Agreement on which a Change in Control occurs.

     (iii) "Initial Investors" means (A) The Trident Partnership, L.P.; (B)
Marsh & McLennan Risk Capital Holdings, Ltd.; or (C) any majority-owned
subsidiary or parent (or equivalent in the case of a non-corporate entity) of
the foregoing.

     (iv) "Permitted Persons" means (A) the Company; (B) any Related Party; or
(C) any group (as defined in Rule 13d-3 under the Exchange Act) comprised of any
or all of the foregoing.

     (v) "Protection Period" means (i) the period beginning on the date hereof
and ending on the first anniversary hereof or (ii) the period beginning on the
Change in Control Date and ending on the second anniversary of the Change in
Control Date.

     (vi) "Related Party" means (A) a majority-owned subsidiary of the Company;
(B) a trustee or other fiduciary holding securities under an employee benefit
plan of the Company or any majority-owned subsidiary of the Company; or (C) a
corporation owned directly or indirectly by the stockholders of the Company in
substantially the same proportion as their ownership of Voting Securities.

     (vii) "Voting Security" means any security of the Company which carries the
right to vote generally in the election of directors.

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                                       3

     5. Acceleration of Vesting Upon Change in Control. All stock options and
restricted stock issued under the Company's 1995 and 1999 Long Term Incentive
and Share Award Plans (or any successor plan) shall become immediately vested in
full and, in the case of stock options, immediately exercisable in full, upon a
Change in Control in accordance with the applicable restricted stock agreements
and stock option agreements.

     6. Termination Following Change in Control. The Executive shall be entitled
to the benefits provided in Section 7 hereof upon any termination of his
employment with the Company and its subsidiaries within a Protection Period,
except a termination of employment (a) because of his death, (b) because of a
"Disability," (c) by the Company or any of its subsidiaries for "Cause," or (d)
by the Executive other than due to "Constructive Termination." No benefits shall
be paid under Section 7 of this Agreement if the Executive's employment
terminates outside of a Protection Period.

          (i) Disability. The Executive's employment shall be deemed to have
     terminated because of a "Disability" if the Executive applies for and is
     determined to be eligible to receive disability benefits under the
     Company's Long-Term Disability Plan.

          (ii) Cause. Termination of the Executive's employment by the Company
     or any of its subsidiaries for "Cause" shall mean termination by reason of
     the Executive's willful engagement in conduct which involves dishonesty or
     moral turpitude in connection with his employment and which is demonstrably
     and materially injurious to the financial condition or reputation of the
     Company. An act or omission shall be deemed "willful" only if done, or
     omitted to be done, in bad faith and without reasonable belief that it was
     in the best interest of the Company. Notwithstanding the foregoing, the
     Executive shall not be deemed to have been terminated for Cause unless and
     until there shall have been delivered to the Executive a written notice of
     termination from the compensation committee of the Board after reasonable
     notice to the Executive and an opportunity for him, together with his
     counsel, to be heard before such committee.

          (iii) Without Cause. The Company or any of its subsidiaries may
     terminate the employment of the Executive without Cause during a Protection
     Period only by giving the Executive written notice of termination to that
     effect. In that event, the Executive's employ-

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                                       4

     ment shall terminate on the last day of the month in which such notice is
     given (or such later date as may be specified in such notice), and the
     benefits set forth in Section 7 hereof shall be provided to the Executive.

          (iv) Constructive Termination. Termination of employment by the
     Executive due to "Constructive Termination" shall mean termination by the
     Executive subsequent to any of the following:

               (A) the assignment of duties and responsibilities inconsistent in
          any material and adverse respect with the Executive's position or a
          significant diminution in his duties or responsibilities; provided,
          however, that Constructive Termination shall not be deemed to occur
          upon a change in duties or responsibilities that is solely and
          directly a result of the Company no longer being a publicly traded
          entity, and does not involve any other event set forth in this
          definition;

               (B) a reduction in the Executive's base salary or bonus
          opportunity;

               (C) the requirement that the Executive work at a location outside
          of Fairfield County, Connecticut, or Westchester County, New York;

               (D) the failure to provide the Executive with benefits and
          incentive compensation opportunities at least as favorable, in the
          aggregate, as the benefits and incentive compensation opportunities
          available to the Executive immediately prior to a Change in Control;
          or

               (E) if the Company has failed to obtain the assumption of the
          obligations contained in this Agreement by any successor as
          contemplated in Section 12(c) hereof.

     The Executive shall exercise his right to terminate employment due to
     Constructive Termination by giving the Company a written notice of
     termination specifying in reasonable detail the circumstances constituting
     such Constructive Termination. In that event, the Executive's employment
     shall terminate on the last day of the month in which such notice is given
     unless an earlier date is specified in writing by the Executive. A
     termination of employment by the Executive shall be due to Constructive
     Termination if one of the occurrences specified in this subsection (iv)
     shall have occurred, notwithstanding that the Executive may have other
     reasons for terminating employment, including employment by another
     employer which the Executive desires to accept.

     7. Benefits Upon Termination Within Protection Period. If, within a
Protection Period, the Executive's employment by the Company and its
subsidiaries shall be terminated (a) by the Company or any of its subsidiaries
other than for Cause and other than because of a Disability or death, or (b) by
the Executive due to Constructive Termination, the Executive shall be entitled
to the benefits provided for below:

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                                       5

          (i) The Company shall pay to the Executive, through the date of the
     Executive's termination of employment, salary at the rate then in effect,
     together with salary in lieu of vacation accrued to the date on which his
     employment terminates, in accordance with the standard payroll practices of
     the Company;

          (ii) The Company shall pay to the Executive an amount equal to the
     product of (A) the amount of the Executive's target annual bonus for the
     year including the Change in Control Date (or the year including the
     termination date, if higher), multiplied by (B) a fraction, the numerator
     of which is the number of days elapsed in the calendar year through the
     date of termination of the Executive's employment, and the denominator of
     which is 365; and such payment shall be made in a lump sum within 10
     business days after the date of such termination of employment;

          (iii) The Company shall pay to the Executive an amount equal to the
     Applicable Multiple times the sum of (A) the Executive's annual base salary
     in effect on the Change in Control Date (or the date of termination, if
     higher), and (B) the Executive's target annual bonus for the year including
     the Change in Control Date (or the year including the termination date, if
     higher); and such payment shall be made in a lump sum within 10 business
     days after the date of such termination of employment; and

          (iv) The Company shall continue to cover the Executive and his
     dependents under, or provide the Executive and his dependents with
     insurance coverage no less favorable than, the Company's life, disability,
     health and dental benefit plans or programs (as in effect on the day
     immediately preceding the Protection Period or, at the option of the
     Executive, on the date of termination of employment) for a period equal to
     the lesser of (x) 24 months following the date of termination or (y) until
     the Executive is provided by another employer with benefits substantially
     comparable (with no preexisting condition limitations) to the benefits
     provided by such plans or programs. To the extent any such benefits cannot
     be provided under the benefit plans or programs of the Company or any of
     its subsidiaries, the Executive will be entitled to receive, on a monthly
     basis following termination, cash payments in an amount equal to the
     monthly cost of such benefits. The statutory health care continuation
     coverage period under Section 4980B of the Internal Revenue Code of 1986,
     as amended (the "Code"), will commence at the end of such 24-month period.

     For purposes hereof, "Applicable Multiple" means (a) in the case of a
termination during the Protection Period described in clause (i) of the
definition thereof, 1.5, and (b) in the case of a termination during the
Protection Period described in clause (ii) of the definition thereof, 2.0. In no
event shall the Executive be entitled to receive more than one Applicable
Multiple of the amount specified in clause (iii) of this Section 7.

     8. Non-Exclusivity of Rights. Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any benefit, bonus,
policies or programs provided by the Company or any of its subsidiaries and for
which the Executive may qualify, nor shall anything herein limit or otherwise
affect such rights as the Executive may have under any stock option or other
agreements with the Company or any of its subsidiaries; provided, however, that
amounts payable

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                                       6

hereunder are in lieu of any severance benefit payable under any other severance
plan or agreement of the Company or its subsidiaries in effect on the date
hereof. Amounts which are vested benefits or which the Executive is otherwise
entitled to receive under any plan, practice, policy or program of the Company
or any of its subsidiaries at or subsequent to the date of termination of the
Executive's employment shall be payable in accordance with such plan, practice,
policy or program.

     9. Full Settlement; Legal Expenses. The Company's obligation to make the
payments provided for in this Agreement and otherwise to perform its obligations
hereunder shall not be affected by any set-off, counterclaim, recoupment,
defense or other claim, right or action which the Company or any of its
subsidiaries may have against the Executive or others. In no event shall the
Executive be obligated to seek other employment or take any other action by way
of mitigation of the amounts payable to the Executive under any of the
provisions of this Agreement, and amounts payable hereunder will not be reduced
by compensation the Executive receives from other employment. The Company agrees
to pay, upon written demand therefor by the Executive, all legal fees and
expenses which the Executive may reasonably incur as a result of any dispute or
contest by or with the Company or others regarding the validity or
enforceability of, or liability under, any provision of this Agreement
(including as a result of any contest by the Executive about the amount of any
payment hereunder), plus in each case interest at the applicable federal rate
provided for in Section 7872(f)(2) of the Code, unless the Company prevails on
all causes of action in the dispute or contest. In any such action brought by
the Executive for damages or to enforce any provisions of this Agreement, the
Executive shall be entitled to seek both legal and equitable relief and
remedies, including, without limitation, specific performance of the Company's
obligations hereunder, in the Executive's sole discretion.

     10. Limitation on Payments by the Company. Anything in this Agreement to
the contrary notwithstanding, in the event that any payment or distribution
made, or benefit provided (including, without limitation, the acceleration of
any payment, distribution or benefit and the acceleration of exercisability of
any stock option) by the Company to or for the benefit of the Executive (whether
paid or payable or distributed or distributable pursuant to the terms of this
Agreement or otherwise) would be subject to the excise tax imposed by Section
4999 of the Code as an "excess parachute payment" (within the meaning of Section
280G of the Code), the payment set forth in Section 7(iii) hereof shall be
reduced to the smallest extent possible such that no amount payable hereunder
constitutes an "excess parachute payment" (within the meaning of Section 280G of
the Code).

     11. Confidential Information; Nonsolicitation of Employees and Customers.
The Executive shall hold in a fiduciary capacity for the benefit of the Company
and its subsidiaries all secret or confidential information, knowledge or data
relating to the Company or any of its subsidiaries, and their respective
businesses, which shall have been obtained by the Executive during the
Executive's employment by the Company or any of its subsidiaries (except for
information, knowledge or data which shall be or subsequently become known or
generally available to the public other than by acts of the Executive or his
representatives in violation of this Agreement). After the date of termination
of the Executive's employment with the Company or any of its subsidiaries, the
Executive shall not, without the prior written consent of the Company,
communicate or divulge any such information, knowledge or data to anyone other
than the Company and those designated by the Company. The Executive shall return
to the Company at the time of the termination of the Executive's employment with

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                                       7

the Company or any of its subsidiaries all tangible property of the Company or
any its subsidiaries in the Executive's possession, including, but not limited
to, confidential information relating to the Company or any of its subsidiaries.
The Executive shall not, during the term of his employment by the Company or any
of its subsidiaries and for one year thereafter, directly or indirectly, on
behalf of the Executive or any other person or entity, (i) induce, or seek to
induce, any employee of the Company or any of its subsidiaries to terminate
employment with the Company or any of its subsidiaries or (ii) solicit business
from any person, firm or company which is (during the period the Executive is
employed by the Company or any of its subsidiaries), or at the time of the
termination of the Executive was, a customer of the Company or any of its
subsidiaries, or induce, or seek to induce, any such customer of the Company or
any of its subsidiaries to cease doing business with the Company or any of its
subsidiaries. In the event of a breach or threatened breach by the Executive of
any provision of this Section 11, the Executive acknowledges that the Company
and its subsidiaries shall be entitled to an injunction restraining the
Executive from such act or threatened act, in addition to monetary damages and
any other available remedies. The Executive hereby expressly consents and agrees
that, for any breach or threatened breach of any provision of this Section 11, a
restraining order and/or an injunction may be issued against the Executive in
addition to any other rights the Company or any of its subsidiaries may have
with respect to such violation or breach. In no event shall an asserted
violation of the provisions of this Section 11 constitute a basis for deferring
or withholding any amounts otherwise payable to the Executive under this
Agreement. The provisions of this Section 11 shall apply to the Executive
whether or not there has been a Change in Control.

     12. Successors.

     (a) This Agreement is personal to the Executive and without the prior
written consent of the Company shall not be assignable by the Executive
otherwise than by will or the laws of descent and distribution. This Agreement
shall inure to the benefit of and be enforceable by the Executive's legal
representatives or successors in interest.

     (b) This Agreement shall inure to the benefit of and be binding upon the
Company and its successors and assigns.

     (c) The Company will require any successor (whether direct or indirect, by
purchase, merger, consolidation or otherwise) to all or substantially all of the
business and/or assets of the Company to assume expressly and agree to perform
this Agreement in the same manner and to the same extent that the Company would
be required to perform it if no such succession had taken place. For this
purpose, any company that becomes directly owned by stockholders of the Company
pursuant to a merger or consolidation in which the Company becomes a wholly
owned subsidiary of such company shall be deemed to be a successor of the
Company. As used in this Agreement, "Company" shall mean the Company as
hereinbefore defined and any successor to its business and/or assets as
aforesaid which assumes and agrees (or is required hereunder to assume and
agree) to perform this Agreement by operation of law or otherwise. A subsequent
Change in Control of a successor shall be considered a Change in Control under
Section 4 hereof upon termination of Executive's employment with the successor
within a Protection Period.

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                                       8

     13. Miscellaneous.

     (a) This Agreement shall be governed by and construed in accordance with
the laws of the State of Connecticut, without reference to principles of
conflict of laws. The captions of this Agreement are not part of the provisions
hereof and shall have no force or effect. This Agreement may not be amended or
modified otherwise than by a written agreement executed by the parties hereto or
their respective successors and legal representatives.

     (b) All notices and other communications hereunder shall be in writing and
shall be given by hand delivery to the other party or by registered or certified
mail, return receipt requested, postage prepaid, addressed as follows:

         If to the Executive:
         Louis T. Petrillo
         124 West 60 Street, Apt. 43F
         New York, New York  10023

         If to the Company:
         Arch Capital Group Ltd.
         20 Horseneck Lane
         Greenwich, CT  06830
         Attention:  Chief Executive Officer

or to such other address as either party shall have furnished to the other in
writing in accordance herewith. Notice and communications shall be effective
when actually received by the addressee.

     (c) The invalidity or unenforceability of any provision of this Agreement
shall not affect the validity or enforceability of any other provision of this
Agreement.

     (d) The Company or any of its subsidiaries may withhold from any amounts
payable under this Agreement such federal, state or local taxes as shall be
required to be withheld pursuant to any applicable law or regulation.

     (e) The Executive's failure to insist upon strict compliance with any
provision hereof shall not be deemed to be a waiver of such provision or any
other provision thereof.

     (f) This Agreement contains the entire understanding of the Company and the
Executive with respect to the subject matter hereof and replaces the letter
agreements dated January 2, 1996 and September 24, 1999 between the Company and
the Executive but, except as otherwise expressly stated herein, does not
supersede or override the provisions of any stock option, employee benefit or
other plan, program, policy or practice in which the Executive is a participant
or under which the Executive is a beneficiary (it being expressly agreed that
the Risk Capital Holdings Inc. Control in Control Severance Plan has been
terminated and the Executive is not entitled to any benefits or rights
thereunder).

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                                       9

     IN WITNESS WHEREOF, the Executive has hereunto set his hand and, pursuant
to the authorization from its Board of Directors, the Company has caused this
Agreement to be executed as of the date first above written.

                             ARCH CAPITAL GROUP LTD.

                             By: /s/ Peter A. Appel
                                ---------------------------------------------
                                Name:  Peter A. Appel
                                Title:  Chief Executive Officer

                             EXECUTIVE:

                             /s/ Louis T. Petrillo
                             ------------------------------------------------
                             Louis T. PetrilloARCH CAPITAL GROUP LTD.
                                20 Horseneck Lane
                          Greenwich, Connecticut 06830

                                                                    June 9, 2000
Ms. Debra M. O'Connor
Debra O'Connor
14 Revere Road
Riverside, CT  06880

Dear Debra:

     This letter confirms your and our agreement on the following terms:

     1. Position & Responsibilities: Arch Capital Group Ltd. ("ACGL") shall
employ you to serve as a Senior Vice President, Controller and Treasurer, and
that in such capacity you shall report to the President and Chief Executive
Officer of ACGL. The term of your employment shall terminate upon notice by
either ACGL to you or by you to ACGL.

     2. Compensation: Compensation for your services shall be at an annual base
salary rate of $169,800 (subject to upward adjustments by the Board of Directors
(the "Board") of ACGL), and an annual performance bonus opportunity to be
determined by the Board. The target rate for the annual bonus for 2000 and
thereafter shall be 40% of the base salary rate.

     3. Additional Terms: You will be eligible to participate in employee
benefit programs of ACGL as are in effect from time to time, including medical,
dental, life insurance, short and long-term disability, 401(k), defined
contribution retirement, stock incentive plans and stock purchase plans, subject
to the respective terms and conditions of such plans.

     You also will be entitled to certain vacation pay and paid holidays, as
outlined in and subject to ACGL's Employee Handbook.

     Notwithstanding anything to the contrary in paragraph 2 above, if your
employment continues to (or ACGL terminates your employment other than for cause
before) the later of (1) March 1, 2001 or (2) the filing of ACGL's Annual Report
on Form 10-K for 2000, you shall receive your target annual bonus for 2000 and,
if applicable, 2001 (in each case, pro

<PAGE>
                                      -2-

rated based on the number of days you are employed during the year) plus
$50,000. Any amount payable under this paragraph shall be made within 10
business days after the determination thereof. "Cause" shall have the meaning
set forth in Section 3(ii) of the Change in Control Agreement referred to in the
next paragraph.

     Following the sale of ACGL's reinsurance operations to Folksamerica
Reinsurance Company, you acknowledge receipt from ACGL of $505,897.30 under the
Change in Control Agreement, dated as of February 25, 1999 (the "Change in
Control Agreement"), between you and ACGL. Upon the execution of this letter,
and in consideration of such payment and the above, you acknowledge and agree
that all of ACGL's obligations under the Change in Control Agreement are
terminated in their entirety, and hereby release ACGL from such obligations,
except for those specified in Section 4(iv) and, solely in respect of such
Section 4(iv), Section 6 of the Change in Control Agreement. It is understood
that your obligations under Section 8 of the Change in Control Agreement shall
remain in full force and effect.

     4. This letter supersedes all prior discussions and agreements between ACGL
and you with respect to the subject matter hereof and constitutes the entire
agreement among the parties relating thereto, shall be governed by the laws of
the State of Connecticut without regard to choice of law rules, and may be
executed in one or more counterparts.

     Please confirm your agreement to the above by signing and returning the
enclosed duplicate of this letter.

                                Sincerely,

                                ARCH CAPITAL GROUP LTD.

                                By:   /s/ Peter A. Appel
                                      ---------------------------------------
                                      Peter A. Appel
                                      President and Chief Executive Officer

AGREED AND ACCEPTED
as of the date hereof:

/s/ Debra O'Connor
----------------------------------
Debra O'Connor

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