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.
Pacification of Algeria
Bugeaud instituted a strategy of scorched earth, combined with fast-moving cavalry columns not unlike those used by al-Qādir to progressively take territory from al-Qādir. The troops' tactics were heavy-handed, and the population suffered significantly. Al-Qādir was eventually forced to establish a mobile headquarters that was known as a "smala" or "zmelah". In 1843 French forces successfully raided this camp while he was away from it, capturing more than 5,000 fighters and al-Qādir's warchest.