We find the following in the Buffalo Commercial:

ON DIT. – That in an interview with the President, before the advance of the army, Gen. McClellan said, that unless he could raise the stars and stripes over Richmond before the 15^th of April, he should resign his commission.

– Published in The Davenport Daily Gazette, Davenport, Iowa, Thursday Morning, April 10, 1862, p. 2