Ist use of M4 was by Marines on Tawara Nov 20th 1943. C Company 1 Marine Amphibious Corps Tank Bat. but only two managed to get into action, most being lost near the beach by swamping- one being destroyed by Navy aircraft, one or two may have been lost to enemy weapons on the beach. Within a month Ist Marine Tank Bat. was re-organised as a Medium Bat with one company of light tanks M3s being replaced by M5A1 but they were still heavily involved in the fighting. Separted Tank Bat. supporting Army infantry Divisons on Bouganville were similarly equiped with M4s from about the same time. M3 (probably M3A5s) were used by the Army on the Gilberts at the same time as the landings on Tawara.