sentences:  During the early hours of April 13, 1975, North Vietnamese personnel from the 126th Battalion and the Viet Cong 471st Battalion landed on Southwest Cay using rubber boats.Taken by complete surprise, the ARVN on Southwest Cay put up stiff resistance, but they surrendered to the North Vietnamese after 30 minutes of fighting.The North Vietnamese claimed to have killed 6 ARVN in action, and taken 33 prisoners.