Short answers, pulled from the story.
Hengyang served as a critical strategic crossroads where two major railway lines met and connected to industrial centers. The city controlled access to Guangxi, Guizhou, Yunnan, and Sichuan while protecting the wartime capital Chongqing from Japanese invasion.
The battle began early on the 23rd of June 1944 when Chinese forces from the 190th Division fired upon Japanese troops attempting to cross the Lei River. This engagement followed incendiary bombing raids that started on the 22nd of June 1944.
Lieutenant General Fang Xianjue led the 10th Army which held the title Mt. Tai Army after victories at the Third Battle of Changsha. He negotiated surrender terms with Major Takeuchi on the 8th of August 1944 before his forces were captured.
Thirty-two thousand citizens signed up to assist the 10th Army after 300,000 residents evacuated over four days and nights starting on the 18th of June 1944. These volunteers organized into six teams to transport munitions fix defenses extinguish fires carry stretchers attend wounded soldiers and collect corpses.
The Japanese launched the Ichigo Operation on the 17th of April 1944 with a goal to control railway lines through central China. Lieutenant General Isamu Yokoyama expected to take Hengyang within one day but faced prolonged resistance from the Chinese 10th Army until August 1944.