Short answers, pulled from the story.
Isamu Yokoyama commanded a force of roughly 60,000 troops to attack Changde. This massive Japanese offensive included six divisions: the 39th, 58th, 13th, 3rd, 116th and 68th.
Yu Chengwan led this 57th Division with only 8,000 men against overwhelming odds. The defending Chinese army consisted of ten corps and two other units while the city itself was guarded by just one division.
The city fell under Japanese control on the 6th of December after a brutal struggle. Fortifications were completely destroyed by the 1st and the 2nd of December.
He was sentenced to five years in prison instead of execution due to pleas from others. Chiang Kai-Shek initially wanted him executed but eventually spared him.
From November 10th until January 17th, the Japanese 116th Division lost 7,547 personnel. By the 5th of January 1944, Japanese forces had returned to their original positions before the offensive began.