 The Japanese were unable to take the city by the middle of February.Subsequently, the number of Japanese troops was increased to nearly 90,000 with the arrival of the 9th Infantry Division and the IJA 24th Mixed Brigade, supported by 80 warships and 300 airplanes.On February 14, Chiang Kai-shek sent the 5th Army, including the 87th and 88th divisions, into Shanghai.