sentences:  He would send the 468th Marine Brigade north to help defend Da Nang as soon as the Airborne Division arrived in Saigon.This division was vital to the defense of III and IV Corps, without which South Vietnam could no longer survive.On 14 March, General Trưởng met with General Thi, commanding I Corps troops in Quảng Trị and Thua Thien Provinces, and General Lan, the Division commander, to explain his concept for the final defense of Da Nang.