Exhibit 31.2

CERTIFICATION UNDER EXCHANGE ACT RULE 13A-15

AND

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Gayle Marshall Johnson, Chief Financial Officer, certify that:

1. I have reviewed this annual report on Form 10-K/A of Potomac
Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The
registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting as defined
in Exchange Act Rules 13(d)-15(f) and 15a-15(f) for the registrant and have:

a) Designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over
financial reporting or cause such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
internal purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the
registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrants internal control over financial reporting that occurred
during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrants internal control
over financial reporting; and

5. The registrants other certifying officer and I have disclosed, based on our most recent evaluation
of internal control over financial reporting, to the registrants auditors and the audit committee of registrants board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrants ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial reporting.



|                    |  |                                                
|------------------- |  | -----------------------------------------------
|Date April 30, 2009 |  | /s/ Gayle Marshall Johnson                     
|                    |  | Gayle Marshall Johnson, Chief Financial
Officer

A signed original of this written statement required by Section 302 of the Sarbanes-Oxley Act of 2002 has
been provided to Potomac Bancshares, Inc. and will be retained and furnished to the Securities and Exchange Commission or its staff upon request.



7