4.2-inch mortars were employed by chemical mortar battalions. Each battalion was authorized forty-eight M2 4.2-inch mortars organized into four companies with three four-tube platoons. Between December 1944 and February 1945, the battalions’ Companies D were inactivated to organize additional battalions.
4.2-inch mortars were employed by specialized units known as chemical mortar battalions. Each battalion was composed of forty-eight M2 mortars organized into four companies with three platoons each. In late 1944 and early 1945, Companies D within these battalions were disbanded to create new battalions.