At the time, British Royal Marine Light Infantry (merged with the Royal Marine Artillery in the 1920s to form the Royal Marines) were used primarily as naval parties onboard Royal Navy warships to maintain discipline and man ships' guns. The RMLI joined a new Royal Navy division, the Royal Naval Division, formed in 1914 (out of those not needed on ships) to fight on land; however, throughout the conflict, army units were depended upon to provide the bulk, if not all, of troops used in amphibious landings.