the troops have been in operation too long and soldiers are extremely tired
The old soldiers are tired. This idiom means that the soldiers are tired and demoralized because they have been using the army for a long time.
essential information
Old: tired; tired: tired.
source
In Zuozhuan Xianggong Jiunian written by Zuo Qiuming in the pre Qin period, it is said that "the teachers of Jin Dynasty can be attacked, but they are old and hardworking, and they have the ambition to return, so they must be conquered." The biography of Xu Qian in the book of Wei states: "Murong has no way, invades our battlefield, and his teachers and soldiers are tired. It's time to die."
Examples
In order to ~, the chief secretary was abolished, and Li Li was responsible for state affairs. (in Ming Dynasty, Shen Defu's "wanliyehuo Bian · Laotian repetition")
the troops have been in operation too long and soldiers are extremely tired
take up the cudgels for the injured party - dǎ bào bù píng
dip one 's finger and water for sth. - rǎn zhǐ chuí xián
Seeking common ground while reserving minor differences - qiú dà tóng,cún xiǎo yì