Three Kingdoms: Sima Yi vs. Zhuge Liang (Part 3/3)

After defeating Ma Su at the crucial battle of Jieting (228 AD), Sima Yi's massive army is approaching a small town where Shu's army supplies are located. Zhuge Liang is there too. The town is pretty much defenseless, but Zhuge Liang managed to mislead Sima Yi into thinking the defenseless town is a trap using a very risky "empty fort strategy", causing Sima Yi to order his army to retreat.