1st Michigan Infantry Regiment (3 months)

The 1st Michigan Infantry Regiment (3 months) was a short-term infantry regiment that served in the Union Army during the early months of the American Civil War. Formed in response to President Abraham Lincoln's call for 75,000 volunteers following the attack on Fort Sumter in April 1861, the regiment was mustered into service for a period of three months.

The 1st Michigan was among the first Union regiments to arrive in Washington, D.C., after the outbreak of hostilities. Its prompt arrival was significant as it helped to bolster the city's defenses at a time when there were concerns about its security and potential capture by Confederate forces. The regiment was commanded by Colonel Orlando B. Willcox.

While its term of service was brief, the 1st Michigan participated in the First Battle of Bull Run (also known as First Manassas) on July 21, 1861. The regiment saw action during the battle, experiencing the chaos and disorganization that characterized the Union defeat.

Following the expiration of their three-month enlistment, the soldiers of the 1st Michigan Infantry Regiment (3 months) were mustered out of service in August 1861. Many of the men subsequently reenlisted in other Michigan regiments for longer terms of service and continued to contribute to the Union war effort throughout the Civil War. The 1st Michigan's quick response and participation in the initial battles of the war provided valuable experience and contributed to the early mobilization of the Union Army.