 A force of North Vietnamese quickly overran large parts of eastern Cambodia reaching to within of Phnom Penh allowing their allies, the Chinese-supported Khmer Rouge to extend their power.Nixon ordered a military incursion into Cambodia by U.S. and ARVN troops in order to both destroy PAVN/NLF sanctuaries bordering South Vietnam and to buy time for the U.S. withdrawal.During the Cambodian Campaign, U.S. and ARVN forces discovered and removed or destroyed a huge logistical and intelligence haul in Cambodia.