sentences:  Later Southwest Cay would be the first major target for the North Vietnamese Navy.On April 4, 1975, the High Command of the VPN and the Command of Military Region 5, under the command of General Chu Huy Man, agreed on a plan to seize some Spratlys and other groups of islands.Under their secret plan, the VPN deployed the 126th Battalion, a naval special forces unit of about 170 personnel, to join the Viet Cong 471st Battalion of Military Zone 5.