War Fronts Aug 31 1944 By United Press NORTHERN FRANCE Allied armies drive into nazi robot launching area; American First army within 30 miles of Belgium, after capturing Laon. SOUTHERN FRANCE American tanks and artillery, aided by thundering air assaults, advance to within 59 miles of Lyon; Germans regain small area near Italian border. RUSSIA Red army captures Romanian oil center of Ploesti, crashes to within 17 miles of Bucharest; Germans report major soviet offensive northeast of Warsaw. ITALY Eighth army units within two miles of Gothic line; allied troops clear more ground in Florence sector, AIR WAR American bombers blast Kiel and Bremen through heavy cloud cover; other U. S. heavies plaster robot launching sites and fighters attack fuel dumps near Dieppe. CHINA Japanese reported launching offensive toward key Kweiiin base in Kwangsi; American air force rips enemy supply lines. BURMA British troops reach upper Chindwin river; other units plunged farther south on Tiddim road.