The meaning of the word "qu" is that the army will be half-reached if the army is half way and the profit is gained.

Those who rush for a hundred miles to compete with the enemy for profit may lose their generals. (Those who rush for fifty miles to compete for profit with the enemy will only be able to make it.)

From "The Biography of Sun Tzu Wu Qi"

Quitong "trends".

trend; rush towards〖tend;hurryoffto〗

Xinhua Dictionary /html3/19288.html