Ernie,
I can't access the MOH info at this time but I did find you man and it seems he was the CO of the Regiment at the end of his service at least.

VIFQUAIN, Victor Colonel Ft Kearney, N. May 10, 1865 Not must'r'd MO July 29, 1865 as Lt. Col.
VIFQUAIN, Victor Lt. Colonel Ft Kearney, N. Oct 11, 1864 Dec 26, 1864 Promoted
VIFQUAIN, Victor Major Ft Kearney, N. Feb 7, 1863 --- Promoted
VIFQUAIN, Victor Adjutant Ft Kearney, N. Sep 1, 1862 Sep 1, 1862 Promoted Major

Hope this helps you. I forget when the battle was. That Sept. 1 date is when the unit was mustered into Federal service.
Frank