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

[481] Missing numbers in the line were also caused by transfers of regiments to a different arm of service; the 7th Cavalry became the 1st Mounted Rifles; the 15th and 50th Regiments served as Engineers; the 19th Infantry was changed to the 3d Artillery; the 113th to the 7th Heavy Artillery; the 129th to the 8th Heavy Artillery; the 130th to the 19th Cavalry (st Dragoons); the 135th to the 6th Heavy Artillery; and the 138th to the 9th Heavy Artillery. The 22d Light Battery, which was organized in October, 1862, was transferred soon after to the 9th Artillery.

For various reasons some of the regiments were discontinued or disbanded before completing their term of enlistment: the 7th Cavalry, organized in October, 1861, was discontinued after six months; the 1st Marine Artillery was mustered out in March, 1863; the 11th Inifantry (Fire Zoulaves) was disbanded in May, 1862; the 53d was discontinued in March, 1862; the 55th was transferred to the 38th in December, 1862; the 87th was transferred to the 40th in September, 1862; the 101st was transferred to the 37th in December, 1862; the 145th was disbanded December 9, 1863, and distributed to the 107th, 123d, and 150th Regiments; and the 163d was transferred to the 73d on January 20, 1863. The 190th and 191st were sm ill battalions which did not leave the State, the war ending soon after their organization was commenced.