Abraham Lincoln actually said...
All regiments of militia or of three-months' volunteers who have offered their services under the recent call of the War Department, and who have so far perfected their organization as to be able to report for orders at St. Louis, at Columbus, or at Washington City by the 10th of June, will be mustered into the service of the United States for three months from that date, the pay of each volunteer or militiaman commencing from the date of his enlistment.
05/30/1862