¥Marines Get HeavyYiet Red PoundingBy EUGENE V. RISHER SAIGON (UPI) — North Vietnamese troop* today battered with rocket*, mortar* and artillery the U. S. Marines bases Mocking their invasion path into South Vietnam. They left 12 Americans dead and 190 wounded.Another 57 Leathernecks died and 77 suffered wounds in an assault on a Communist fortress hill before Marine* withdrew and let American bomber* take over the assault today.Tbepf i g h t-i tig .raged just below, the North-South Vietnam border in the rain-soaked jungle Mils. Hard-pressed Marines reported toe.almost unprecedentea Communist attack ravaged their none too large jtockr; of aircraft, damaging 30 helicopters and two transport*. -U S Air Force B52 Stratofortressesswung: m/to help. Twice toey' J»pedimvai of tons of bomb* on the elite North Vietnamese battalion that held off Marines on Wood-drenched Hill 861 near toe Laos border To toe east, near the coast, the big bombers hit Communist concentrations assaulting the Marine bases.Xj. s. spokesmen said heavy clouds drifted otec-Norto Vietnam and cut U. S. air at-tacks to 48 missions Thursday. The weather save toe North Vietnamese sometomg of a breather after a week «f almost unprece-dent^;attacS: ^^^'* ★ ★The planes that did attack Thursday incentrated on the Communist air defense r-tem that brought down 13 American air-aftxince last Wednesday.In the border war, the Communists for # second time in the war fired artillery pm the Demilitarized Zone (DMZ) be-jeen North and South Vietnam. They uned 600 to 700 rounds of medium artil-ry and mortar shells onto the guns of Gio inh, toe 175mm howitzers toe Marines use i rake Communists in the DMZ and be-,nd. The Gio Linh “long tom” rite sits on plateau three miles below the DMZ.rockets and mortars at the Marine base camp at Dong Ha seven miles to the south. Two hours later the Communists' guns spit fire at the sprawling 3rd Marine Division headquarters complex at Pbu Bai.UPI correspondent Robert Kaylor at Dong Ha reported the 13 Marines killed and 190 wounded in toe three attacks.12 Presumed DeadIn Plane DitchingSouth Of JapaYOKOSUKA, Japan (UPI) — A U.S. Navy P3A turboprop plane ditched in the sea today off Tushima Island in southern Japan. A Navy spokesman said all 12 men aboard were presumed dead.The spokesman said an American - Japanese' search and rescue unit failed to find any trace of the lost crew.He said rescue operations would continue but “all 12 crewmen are presumed to have died in the mishap. ‘Two liferafts and emergency dye markers were found at the crash scene but both rafts were empty.The four-engine plane, the military version of the Lockheed Electra, was on a routine patrol of the area.The crew was assigned to Patrol Squadron 4 at Barbers Point Naval Air Station in Honolulu, the spokesman said, the squadron was deployed to Japan last year.Lunar Tests DelayedCAPE KENNEDY, Fla (AP) — Development problems will delay the first unmanned test flights of the Saturn 5 moon rocket and a lunar-landing vehicle until the last half of this year, the space agencyAt the same time the Communists fired says.