The M13 served at the landing at Anzio with the VI Corps of the Fifth United States Army in January 1944. It was used as an anti-aircraft weapon during the initial landing and then later as a ground support weapon to repel heavy German "panzer" attacks on the beachhead. It was replaced three months later by the M16 Multiple Gun Motor Carriage in April 1944. Only 139 examples were deployed overseas by the U.S. Army.