Document:

<PAGE>

                                                             Exhibit 4(b)(xii)

                             ASSIGNMENT OF GUARANTEE

     THIS ASSIGNMENT OF GUARANTEE (this "Assignment") is made as of the 15th day
of December, 1997, by and between Wachovia Corporation, a North Carolina
corporation ("Wachovia"), and Central Fidelity Banks, Inc., a Virginia
corporation ("Central Fidelity").

                                    RECITALS

     WHEREAS, Central Fidelity and The Bank of New York, a New York banking
corporation (the "Guarantee Trustee") heretofore executed and delivered a
Guarantee Agreement, dated as of September 4, 1997, (the "Guarantee Agreement");

     WHEREAS, pursuant to the Guarantee Agreement, Central Fidelity irrevocably
and unconditionally agreed to pay in full to the holders of certain securities
(the "Trust Securities") issued by Central Fidelity Capital Trust I, a Delaware
statutory business trust (the "Issuer"), certain payments or distributions,
without duplication, with respect to the Trust Securities, to the extent not
paid or made by or on behalf of the Issuer;

     WHEREAS, effective on December 15, 1997, a wholly owned subsidiary of
Wachovia merged with and into Central Fidelity and Central Fidelity then merged
with and into Wachovia, pursuant to the Agreement and Plan of Merger, dated as
of June 23, 1997, by Wachovia and Central Fidelity; and

     WHEREAS, Section 8.01 of the Guarantee Agreement provides that Central
Fidelity will not assign its obligations under the Guarantee Agreement unless,
among other things, the assignee agrees in writing to perform Central Fidelity's
obligations under the Guarantee Agreement.

     NOW, THEREFORE, Wachovia hereby agrees to perform the obligations of
Central Fidelity under the Guarantee Agreement.

     This instrument may be executed in any number of counterparts, each of
which is an original, but all such counterparts shall together constitute but
one and the same instrument.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Assignment to be
duly executed as of the day and year first above written.

                                        WACHOVIA CORPORATION

                                        By: /S/ Kenneth W. McAllister
                                        -----------------------------
                                        Name: Kenneth W. McAllister
                                        Title: Senior Executive Vice President

                                        CENTRAL FIDELITY BANKS, INC.

                                        By: /S/ William N. Stoyko
                                        -------------------------
                                        Name: William N. Stoyko
                                        Title: Coporate Executive Vice President

                                      -2-<PAGE>
                                                              Exhibit 4(b)(xiii)

                             ASSIGNMENT OF GUARANTEE

     THIS ASSIGNMENT OF GUARANTEE (this "Assignment") is made as of the 31st day
of August, 2001, by and between First Union Corporation, a North Carolina
corporation ("First Union"), and Wachovia Corporation, a North Carolina
corporation ("Wachovia").

                                    RECITALS

     WHEREAS, Central Fidelity Banks, Inc., a Virginia corporation ("Central
Fidelity") and The Bank of New York, a New York banking corporation (the
"Guarantee Trustee"), executed and delivered a Guarantee Agreement, dated as of
April 23, 1997 (the "Guarantee Agreement");

     WHEREAS, pursuant to the Guarantee Agreement, Central Fidelity irrevocably
and unconditionally agreed to pay in full to the holders of certain securities
(the "Trust Securities") issued by Central Fidelity Capital Trust I, a Delaware
statutory business trust (the "Issuer"), certain payments or distributions,
without duplication, with respect to the Trust Securities, to the extent not
paid or made by or on behalf of the Issuer;

     WHEREAS, effective on December 15, 1997, a wholly owned subsidiary of
Wachovia merged with and into Central Fidelity and Central Fidelity then merged
with and into Wachovia, pursuant to the Agreement and Plan of Merger, dated as
of June 23, 1997, by Wachovia and Central Fidelity;

     WHEREAS, Wachovia and Central Fidelity executed and delivered an assignment
of guarantee as of December 15, 1997, pursuant to which Wachovia agreed to
perform the obligations of Central Fidelity under the Guarantee Agreement;

     WHEREAS, effective as of September 1, 2001, Wachovia merged with and into
First Union, with First Union as the surviving corporation, pursuant to the
Agreement and Plan of Merger, dated as of April 15, 2001, as amended and
restated and otherwise amended or modified, between First Union and Wachovia;
and

     WHEREAS, Section 8.01 of the Guarantee Agreement provides that Central
Fidelity will not assign its obligations under the Guarantee Agreement unless,
among other things, the assignee agrees in writing to perform Central Fidelity's
obligations under the Guarantee Agreement.

     NOW, THEREFORE, First Union hereby agrees to perform the obligations of
Wachovia as successor to Central Fidelity under the Guarantee Agreement.

     This instrument may be executed in any number of counterparts, each of
which is an original, but all such counterparts shall together constitute but
one and the same instrument.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Assignment to be
duly executed as of the day and year first above written.

                                        FIRST UNION CORPORATION

                                        By: /s/ Anthony Augliera
                                            ___________________________________
                                        Name: Anthony Augliera
                                        Title: Senior Vice President

                                        WACHOVIA CORPORATION

                                        By: /s/ Kenneth W. McAllister
                                          _____________________________________
                                        Name: Kenneth W. McAllister
                                        Title: Senior Excecutive Vice President
                                               and General Counsel<PAGE>

                                                                 Exhibit 4(a)(v)

                            FIRST UNION CORPORATION,

                              WACHOVIA CORPORATION

                                       AND

                         BANK ONE, NATIONAL ASSOCIATION,

                                              as Trustee

                          FIRST SUPPLEMENTAL INDENTURE

                           Dated as of August 31, 2001

                                       to

                                    INDENTURE

                          Dated as of January 31, 1997

                       JUNIOR SUBORDINATED DEBT SECURITIES

<PAGE>

     FIRST SUPPLEMENTAL INDENTURE, dated as of August 31, 2001, among FIRST
UNION CORPORATION, a North Carolina corporation ("Successor"), WACHOVIA
CORPORATION, a North Carolina corporation ("Wachovia"), and BANK ONE, NATIONAL
ASSOCIATION, a national banking association, (formerly known as The First
National Bank of Chicago) as trustee (the "Trustee").

     WHEREAS, Wachovia and the Trustee have heretofore executed and delivered a
certain Indenture, dated as of January 31, 1997 (the "Indenture"; capitalized
terms not otherwise defined herein shall have the meanings set forth in the
Indenture), providing for the issuance from time to time of Securities;

     WHEREAS, Wachovia and Successor have entered into an Agreement and Plan of
Merger, dated as of April 15, 2001 (as amended and restated and otherwise
amended or modified, the "Merger Agreement"), which contemplates the execution
and filing of articles of merger (the "Articles of Merger") providing for the
merger of Wachovia with and into Successor (the "Merger"), with Successor
continuing its corporate existence under the laws of the State of North
Carolina;

     WHEREAS, Section 8.1 of the Indenture provides, among other things, that
upon the merger of the Company with or into any other Person, the due and
punctual payment of the principal of (and premium, if any) and interest on the
Securities of each series according to their tenor and the due and punctual
performance and observance of all the covenants and conditions of the Indenture
to be kept or performed by the Company shall be expressly assumed, by
supplemental indenture satisfactory in form to the Trustee, and executed and
delivered to the Trustee by the Person into which the Company shall have been
merged;

     WHEREAS, Section 9.1 of the Indenture provides, among other things, that,
without the consent of any Holders, the Company, when authorized by a Board
Resolution, and the Trustee, at any time and from time to time, may enter into
one or more indentures supplemental to the Indenture, in form satisfactory to
the Trustee, to evidence the succession of another Person to the Company, and
the assumption by any such successor of the covenants of the Company in the
Indenture and in the Securities;

     WHEREAS, Successor and Wachovia desire and have requested that the Trustee
join in the execution of this First Supplemental Indenture for the purpose of
evidencing such succession and assumption;

     WHEREAS, the execution and delivery of this First Supplemental Indenture
has been authorized by resolutions of the boards of directors of Wachovia and
Successor; and

     WHEREAS, all conditions precedent and requirements necessary to make this
First Supplemental Indenture a valid and legally binding instrument in
accordance with its terms have been complied with, performed and fulfilled and
the execution and delivery hereof have been in all respects duly authorized;

     NOW, THEREFORE, THIS FIRST SUPPLEMENTAL INDENTURE WITNESSETH:

<PAGE>

     For and in consideration of the premises and intending to be legally bound
hereby, it is mutually covenanted and agreed, for the equal and proportionate
benefit of all Holders, as follows:

                                  ARTICLE ONE

                    REPRESENTATIONS OF WACHOVIA AND SUCCESSOR

     Each of Wachovia and Successor represents and warrants to the Trustee as
follows:

     SECTION 1.1. It is a corporation duly organized, validly existing and in
good standing under the laws of the State of North Carolina.

     SECTION 1.2. The execution, delivery and performance by it of this First
Supplemental Indenture have been authorized and approved by all necessary
corporate action on the part of it.

     SECTION 1.3. The Merger will become effective in accordance with the terms
of the Merger Agreement and North Carolina law when the Articles of Merger are
filed in the office of the Secretary of State of the State of North Carolina, or
at such later date or time as the Successor and Wachovia agree and specify in
the Articles of Merger (the time the Merger becomes effective being the
"Effective Time").

     SECTION 1.4. After giving effect to the Merger, no Event of Default, and no
event which, after notice or lapse of time, or both, would become an Event of
Default, shall have occurred and be continuing.

                                  ARTICLE TWO

                            ASSUMPTION AND AGREEMENTS

     SECTION 2.1. Successor hereby assumes the due and punctual payment of the
principal of (and premium, if any) and interest on the Securities of each series
according to their tenor and the due and punctual performance and observance of
all the covenants and conditions of the Indenture to be kept or performed by the
Company.

     SECTION 2.2. Securities authenticated and delivered after the execution of
this First Supplemental Indenture may, and shall if required by the Company,
bear a notation in form approved by the Company as to any matter provided for in
this First Supplemental Indenture.

     SECTION 2.3. Successor shall succeed to, and be substituted for the
Company, with the same effect as if it had been named in the Indenture as the
party of the first part, and the Company hereupon shall be relieved of any
further liability or obligation under the Indenture or upon the Securities.

<PAGE>

                                  ARTICLE THREE

                                  MISCELLANEOUS

     SECTION 3.1. The recitals contained herein shall be taken as the statements
of the Company and Successor, and the Trustee does not assume any responsibility
for their correctness. The Trustee makes no representations as to the validity
or sufficiency of this First Supplemental Indenture.

     SECTION 3.2. If any provision of this First Supplemental Indenture limits,
qualifies or conflicts with the duties imposed by any of Sections 310 to 317,
inclusive, of the Trust Indenture Act through operation of Section 318(c)
thereof, such imposed duties shall control.

     SECTION 3.3. Nothing in this First Supplemental Indenture, express or
implied, shall give to any Person, other than the parties hereto and their
successors and assigns, any benefit or any legal or equitable right, remedy or
claim under this First Supplemental Indenture.

     SECTION 3.4. This First Supplemental Indenture shall be governed by and
construed in accordance with the laws of the State of New York, and for all
purposes shall be governed by and construed in accordance with the laws of such
State, without regard to the conflicts of laws principles thereof.

     SECTION 3.5. This First Supplemental Indenture may be executed in any
number of counterparts, each of which so executed shall be deemed to be an
original, but all such counterparts shall together constitute but one and the
same instrument.

     SECTION 3.6. This First Supplemental Indenture shall become effective as of
the Effective Time.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental
Indenture to be duly executed, and their respective corporate seals to be
hereunto affixed and attested all as of the day and year first above written.

                                     WACHOVIA CORPORATION

                                     By /s/ Kenneth W. McAllister
                                       -----------------------------------------
                                       Name: Kenneth W. McAllister, Esq.
                                       Title:  Senior Executive Vice President
                                                   and General Counsel

(Corporate Seal)

Attest:

 /s/ William M. Watson, Jr.
------------------------------
Secretary

                                     FIRST UNION CORPORATION

                                     By /s/ Ross E. Jeffries, Jr.
                                       -----------------------------------------
                                       Name:  Ross E. Jeffries, Jr.
                                       Title: Senior Vice President

(Corporate Seal)

Attest:

/s/ Anthony Augliera
------------------------------
Assistant Secretary

<PAGE>

                                     BANK ONE, NATIONAL ASSOCIATION
                                     (formerly known as The First National Bank
                                     of Chicago), as Trustee

                                     By /s/ Steve M. Husbands
                                       -----------------------------------------
                                       Name: Steve M. Husbands
                                       Title: Assistant Vice President

(Corporate Seal)

Attest:

      ILLEGIBLE
-------------------------------------

<PAGE>

STATE OF      NORTH CAROLINA        )
         ---------------------------
                                    ): ss.:
COUNTY OF     FORSYTH               )
          --------------------------

     On this 31 day of August, 2001, before me, the undersigned officer,
personally appeared Kenneth W. McAllister, who acknowledged himself or herself
to be the Senior Executive Vice President & General Counsel of WACHOVIA
CORPORATION, a North Carolina corporation, and that he or she as such officer,
being authorized to do so, executed the foregoing instrument for the purposes
therein contained by signing the name of the corporation by himself or herself
as such officer.

     IN WITNESS WHEREOF, I hereunto set my hand and official seal.

                                     /s/ M. MARIE HARPER
                                     -------------------------------------------
                                     Notary Public

[SEAL]

STATE OF      NORTH CAROLINA
          --------------------------)
                                    ): ss.:
COUNTY OF      MECKLENBURG          )
          --------------------------

     On this 31 day of August, 2001, before me, the undersigned officer,
personally appeared Ross E. Jefferies, who acknowledged himself or herself to be
the Senior Vice President of FIRST UNION CORPORATION, a North Carolina
corporation, and that he or she as such officer, being authorized to do so,
executed the foregoing instrument for the purposes therein contained by signing
the name of the corporation by himself or herself as such officer.

     IN WITNESS WHEREOF, I hereunto set my hand and official seal.

                                     /s/ Loretta M. Lucenti
                                     -------------------------------------------
                                     Notary Public

[SEAL]

<PAGE>

STATE OF NEW YORK                 )
         -------------------------
                                  ): ss.:
COUNTY OF NEW YORK                )
          ------------------------

     On this 31 day of August, 2001, before me, the undersigned officer,
personally appeared Steven M. Husbands, who acknowledged himself or herself to
be the Assistant Vice President of BANK ONE, NATIONAL ASSOCIATION, a national
banking association, (formerly known as The First National Bank of Chicago) and
that he or she as such officer, being authorized to do so, executed the
foregoing instrument for the purposes therein contained by signing the name of
the association by himself or herself as such officer.

     IN WITNESS WHEREOF, I hereunto set my hand and official seal.

                                          /s/ Mark E. Davis
                                     -------------------------------------------
                                     Notary Public

[SEAL]

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