《宋史·列传·卷五十一》
出使回来，又对皇上说：陕西兵力二十万，分别屯守四路，但实际可用来应战的只有十万。
使还，上言：陕西兵二十万，分屯四路，然可使战者止十万。
After returning from his mission, he told the emperor again: The Shaanxi army is 200,000 strong and is stationed in four directions, but only 100,000 can actually be used for combat.