Short answers, pulled from the story.
The Third Battle of Changsha began on the 24th of December 1941. This offensive started just days after the attack on Pearl Harbor and was timed to sever Chinese lines of communication with British Hong Kong.
Japanese Eleventh Army commander General Korechika Anami led the main force consisting of 27 infantry battalions, 10 artillery battalions, and one artillery battery. His strategy relied on a swift attack by light forces which resulted in a slender supply route that proved to be a logistical weakness.
General Xue Yue lured the Japanese deep into their territory and severed their supply lines from the rear to force them back into retreats. The Chinese penetrated to the rear of the main Japanese force and cut off supplies causing ammunition and rations to plunge to dangerously low levels.
Historian Richard B. Frank estimates the Japanese lost almost 57,000 troops including some 33,941 killed and 23,003 wounded. The New York Times estimated the Japanese had lost some 52,000 men in the fighting around Changsha while the Japanese army reported losses as 1,591 killed and 4,412 wounded.
Li Yutang was promoted to deputy commander of the 27th army group on the 24th of January 1942. He continued serving as the commander of the 10th corps until he resigned on the 28th of March 1942 to serve fully as deputy army group commander.