noun
scorched-earth strategy; scorched-earth tactics
A military strategy of destroying anything that might be useful to the enemy while advancing through or withdrawing from an area.
撤退する軍隊は焦土戦術をとった。
The retreating army adopted a scorched-earth strategy.
Compound of 焦土 (scorched earth) and 戦術 (tactics/strategy). The term is a direct calque of the English 'scorched-earth strategy'.