In May of 1862 rumors that the enemy in great force was advancing on Washington resulted in an urgent call on the governors of States to forward immediately to Washington all volunteer and militia forces in their States. In response to this call the Sixty-seventh, organized and mustered into United States service for three months. These Regiments relieved the veteran forces at Camp Butler and Camp Douglas, which were sent to the front. The Sixty-seventh Regiment was organized at Camp Douglas, Chicago, June 13, 1862, where it remained during its term of service doing garrison duty. Companies "A," "G," "H," and "K" went to Vicksburg, Miss., with a detachment of rebel prisoners. Returned to Camp Douglas, Chicago, and were mustered our October 6, 1862.