Short answers, pulled from the story.
The Battle of Northern Burma and Western Yunnan was fought to reopen the China-India Highway, the overland supply route between China and its allies. Japan had severed the Burma Road in 1942, forcing military supplies to be flown over the Himalayas on a route known as "The Hump."
General Wei Lihuang of the Chinese National Army served as commander-in-chief, with General Joseph Stilwell of the US Army as his deputy. Allied forces included the Chinese Army in India, the Chinese Expeditionary Force, and British and Indian troops.
Allied forces numbered between 200,000 and 400,000 troops, while Japan fielded between 90,000 and 150,000 soldiers. The campaign cost more than 80,000 Allied casualties, and the Allies claimed to have killed more than 30,000 Japanese soldiers.
The campaign ended in late March 1945 at Muse, in Burma, where the Chinese Expeditionary Force, the British Army, and Merrill's Marauders converged. That junction resulted in Japan losing the North Burma Stronghold and reopened the southwest China supply route.
In June 1945, the Nationalist Government awarded the Flying Tiger Flag to eleven units, including the 36th, 87th, 88th, and honorary 1st divisions for recapturing Longling, and the new 22nd and 38th divisions for their actions in Burma. On the 27th of September 1945, the 9th division of the 2nd army received the flag in a separate ceremony.
The Chinese Expeditionary Force crossed the Nu River into western Yunnan on the 17th of April 1944, opening the campaign's second front. It fought at Tengchong, Mount Song, and Longling before converging with Allied forces at Muse in late March 1945.