5 TANKS SMASHED; U. S. MARINES IN ACTION ON KOREAN FRONT
N Koreans pierce Naktong River line; drive toward Taegu halted by US troops; US marines and infantry move slowly toward Chinju: Lt Gen Walker orders units to step up drive; N Koreans reptdly reach Naktong River E bank, Kunwi area; seen developing push on Taegu through Waegwan corridor while US concentrates on Chinju offensive: bridgeheads seen no threat to Taegu if breakthrough can be averted; N Koreans suffer heavy casualties, S sector; continue to bring in reinforcements; attack near Yonggi; S Koreans hold line, Yongdok area; MacArthur hdqrs repts drive, Chinju front, achieving objectives; 3-prong soutnern drive described; illus