Burnside's "Mud March"

Wednesday, January 21, 1863

The Thirteenth New Hampshire received orders to march at 4 A.M. Although the regiment lined up in preparation for a march the Army of the Potomac was stalled due to a blinding rainstorm and ensuing mud.¹

References:
¹S. Millett Thompson, Thirteenth Regiment of New Hampshire Volunteer Infantry in the War of the Rebellion, 1861-1865 : A Diary Covering Three Years and a Day (Boston, Massachusetts: Houghton, Mifflin and Company, 1888), 101-102.