 On September 22, 1947, the nationalist 49th Army attempted to breakout and flee south, but was completely annihilated at the region of Senior Border (Lao Bian).The communist 2nd frontline command then directed all of its resources to destruct the railway from Jinzhou to Shanhai Pass, which was completed successfully, thus greatly reduced the nationalist transportation capacity.The continuous defeats forced Chen Cheng to send the newly organized 6th Army from Tieling to reinforce Jinzhou, leaving the region between Siping and Tieling vulnerable.