After the Hundred Regiments Offensive, the Japanese army took revenge on the anti-Japanese base areas with the Three Alls Policy, and many villages were burned to ruins.
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三光 is short for 杀光、烧光、抢光: kill all, burn all, loot all. At its height in 1941 and 1942 the campaign fell hardest on the Communist base areas of north China, in reprisal for the 百团大战 of 1940.