Allies Try To Smash Red Viet Buildup'•y 111Esmimicir78ofycmw;staBy JACK WALSHSAIGON (UPI)-In battling around Saigon, U,S. forces killed 218 Viet Cong but some 400 guerrillas ambushed and mauled a 350-man South Vietnamese force, military spokesmen said today.The weekend fighting roared as Allied units tried to smash a Communist buildup around the capital,as. troop* killed 163 Communists in four battles within 30 miles of Saigon. The Americanssuffered 10 men killed and 43wounded. B52 bombers killed the rest of the Communists in. a strike 35 miles below ttracapital.But in the Mekong Della jungles 62 miles south of Saigon a Viet Cong battalion trapped two South Vietnamese comp a* nies ki machine gun crossfire. South Vietnamese spokesmen described their losses Sunday as “heavy—owr 100 men were killed or wounded,U..S, infantrymen struck the heaviest blow 1n a rice paddy district 19 miles southwest of Saigon, Fighting Saturday and Sunday, they killed 55 of the guerrillas. In the same area they killed 42 early last week.Two batUes erupted in Ihe Infiltration routes the guerrillas used from the Cambodian Ijcrder iwrthw-est of Saigon,In one of the fights, an armored unit of life U.S. Army 25th Infantry Division headed off about 200 guerrillas near Uw village of Do Dan Ha. 30 miles from ihe capital. The troops kepi the guerrillas pinned while arthlory and aircraft eamc into action, killing 34 of the Communists in an ll-hour fight.Nearby, Iroops of the IWHJi Light Infants Brigade bat JIM a second guerrilla Force, killing 1ft in a daylong fight. Of the four fights, U.S. easuallies here were the heaviest, totalling six dead and 20 wounded.piai h d fc J sV