KEY CITY BETRAYED; 2 Nationalist Generals Change Sides, Hand Changsha to Reds
Changsha fall follows defection of Gens Cheng Chien and Chen Ming-jen; betrayal seen likely to spur Communist advance on Canton; Nationalists fear deteriorating mil situation may swell ranks of Kuomintang leaders ploting to surrender; Kanhsien threatened by 5 armies; 2 Communist columns reptd within 80 mi of Lanchow; Taklung and Tienshui reptd captured