 After rescuing the Vietnamese from the Cambodians , ARVN was tasked with saving the Cambodians from the North Vietnamese . The goal was to relieve the city of Kompong Cham , 70 kilometers northwest of the capital and the site of the headquarters of Cambodia 's Military Region I. On 23 May , General Tri led a column of 10 @,@ 000 ARVN troops along Route 7 to the 180 @-@ acre ( 0 @.@ 73 km2 ) <unk> rubber plantation , where PAVN resistance was expected to be heavy . <unk> , no battle ensued and the siege of Kompong Cham was lifted at a cost of 98 PAVN troops killed . 
