The Twelfth Cavalry arrived in Australia on 26 July 1943 and began six months of jungle and amphibious training. The Regiment's first assault in the Pacific War came on 29 February 1944 when her soldiers assaulted the Los Negros Islands in the Admiralty Islands, north of New Guinea. The Twelfth Cavalry was assigned to the Leyte-Samar Campaign and helped liberate those islands from Japanese control in spite of stubborn resistance. Continuing the attack onto the island of Luzon, Regimental history was highlighted on 3 February 1945 when a flying column of Cavalrymen cut a 100-mile path through enemy-held territory to be the "First in Manila".