"…If it's just 10,000 troops, we don't need to worry…" Feng Zhen frowned. "However, a late-night ambush would require strong soldiers with good eyes. Otherwise, they'd basically be sending a bunch of blind soldiers into battle…We can't guarantee that they don't have backup troops as well…"
Even though Jiang Pengji always made surprise attacks at night with her troops, night ambushes were rarely used on the battlefield because of their very low rate of success.
Of course, a successful night raid would also bring about substantial results. If they managed to kill a lot of people without losing any of their men, that would be a wild success. After all, the biggest risks sometimes led to the biggest rewards in war.