Scorched earth
A scorched-earth policy is a military strategy that aims to destroy anything that might be useful to the enemy while it is advancing through or withdrawing from a location. Any assets that could be used by the enemy may be targeted, for example food sources, water supplies, transportation, communications, industrial resources, and even the locale's people themselves.
Eastern Front (World War II)
Stalin ordered the retreating Red Army to initiate a scorched-earth policy to deny the Germans and their allies basic supplies as they advanced eastward. To carry out that order, destruction battalions were formed in front-line areas, having the authority to summarily execute any suspicious person. The destruction battalions burned down villages, schools, and public buildings. As a part of this policy, the NKVD massacred thousands of anti-Soviet prisoners.