EXHIBIT 16.1 March 30, 2004 Securities and Exchange Commission 450 Fifth Street, N.W. Washington, DC 20549 Gentlemen: We have read Item 4 of Form 8-K dated March 30, 2004 of ACNB Corporation and are in agreement with the statements contained in the paragraphs. Sincerely, /s/ Stambaugh Ness, PC cc: John W. Krichten, CFO