The original words of this sentence are "Before the Sichuan Army left, the Guangdong Army was exhausted", which is used to describe that during the period of China and War of Resistance against Japanese Aggression, the Guangdong Army made great sacrifices to support War of Resistance against Japanese Aggression, while the Sichuan Army in Sichuan Province failed to leave Sichuan in time for various reasons, which led to Guangdong Province becoming the front line of China's anti-Japanese war.

Guangdong Province, a province in the south of China, has a very important geographical position and is the frontier of China's anti-Japanese war. In War of Resistance against Japanese Aggression, Guangdong has become one of the important battlefields in War of Resistance against Japanese Aggression, China. Due to the terrain and other reasons in Guangdong Province, the troops in Guangdong Province faced great difficulties in the battle against Japanese invaders, but they were brave and good at fighting and made great contributions to War of Resistance against Japanese Aggression in China.

Sichuan Army refers to the army from Sichuan Province, which was once regarded as the backbone of China's anti-Japanese war because of its relative stability and rich resources in the early days of War of Resistance against Japanese Aggression. However, after the full-scale anti-Japanese war broke out on 1937, the Sichuan army did not leave Sichuan in time for the anti-Japanese war, but did not leave Sichuan until 1939, making Guangdong Province the front line of China's anti-Japanese war.

Therefore, this sentence is a tribute to the great contribution and sacrifice made by Guangdong's Guangdong Army in War of Resistance against Japanese Aggression, and at the same time, it also expresses dissatisfaction and criticism that Sichuan Army failed to leave Sichuan in time.