Kangxi and Zuo lived in different times. Although they were all in the Qing dynasty, during the Kangxi period, they went out to fight only by the number of military forces. At that time, although there were not many people in Xinjiang, they were all strong and hard to beat. Moreover, the original troops in Xinjiang will inevitably have symptoms of acclimatization, which is not conducive to combat.

When Zuo left for Xinjiang, we already had advanced weapons and could suppress Xinjiang with absolute strength. He attacked Xinjiang with his own cannon. At that time, the army had just defeated the Taiping Heavenly Kingdom, and the soldiers were excited and well-trained. It is natural for such an army to attack the lazy army in Xinjiang, so Zuo can quickly win Xinjiang in a year and a half, while Kangxi Qianlong has to wait that long.

During the Kangxi period, the enemy of Xinjiang was Junggar, which was in its heyday. Their ancestors used to live in Xinjiang. It can be said that Xinjiang is their home. They are very familiar with the topography of Xinjiang. They can take advantage of unpredictable climate and common tactics. It is absolutely impossible for the Qing army to defeat Junggar for a while.

The enemy of the left is Agubo, who invaded Xinjiang while the Qing army was not looking. He is not very familiar with the topography and climate of Xinjiang, and Agubo is short of troops and weak in soldiers. Once they meet a strong enemy, their soldiers will only retreat. Their army is also cruel and has no mercy on the people. They burned and looted everywhere, and the people were miserable and naturally vulnerable.