William F. Fox, Lt. Col. U. S. V., Regimental Losses in the American Civil War, 1861-1865: A Treatise on the extent and nature of the mortuary losses in the Union regiments, with full and exhaustive statistics compiled from the official records on file in the state military bureaus and at Washington

[511] “retain, until otherwise officially designated, its infantry number.” Its principal losses in battle occurred while serving as infantry and before it was converted to heavy artillery, during which it lost at Baton Rouge 15 killed, 44 wounded, and 6 missing; and, at Port Hudson, 20 killed and 129 wounded. An excessive proportion of the wounded died of their injuries.

Almost the entire loss in battle of the 22d Infantry occurred in one action, at Chickamauga, after which it was assigned to duty as a provost-guard, and, at times, on duty as engineers. The 9th Infantry served most of its time as the Provost-guard of the Army of the Cumberland, and was attached to General Thomas's Headquarters.

The best known, and one of the most efficient of the Michigan regiments in the West, was “Innes's” First Michigan Engineers, which was composed almost entirely of mechanics and engineers. Like the other engineer commands, it was a large regiment--1,800 strong — containing 12 companies of 150 men each. In repairing the damaged railroads along the lines of communications these men built bridges and trestles whose combined length could be measured by the mile, and erected block-houses by the score. The construction of some of these bridges, their size and height, and the marvellous quickness with which they were rebuilt, constituted some of the most wonderful feats of military engineering. This regiment could fight also, as well as do other duty, and a