sentences:  Ten days later, an additional similar brigade was formed.A Marine brigade was responsible for the defense of Long Binh in the final defense around Saigon.On 19 April as the JGS ordered a withdrawal from Xuân Lộc, a new defensive line was formed east of Bien Hoa at the town of Trảng Bom which was defended by the remnants of the 18th Division, the 468th Marine Brigade and the reconstituted 258th Marine Brigade.