Three companies of men, nearly full, had been offered from the Upper Peninsula in September, while there was reason to believe that in the same section three more could be raised. With this in view, the 27th, with the assent of the Government, was ordered organized, with headquarters at Port Huron, in command of Lieutenant Colonel Thomas S. Sprague. Authority had also been given by the War Department to Colonel Kellogg to raise the 7th Cavalry, and upon being confirmed by the Governor the regiment was ordered organized, with rendezvous at Grand Rapids.