War of attrition does not mean casualty numbers, it means the goal of the war is to wear down the enemy so that their will to fight collapses which both the Taliban and the US tried to do, see: https://www.csis.org/analysis/afghan-war-attrition-peace-tal...
War of attrition almost certainly requires high continual casualty numbers, it's literally in the first sentence of the Wikipedia article:
> Attrition warfare is a military strategy consisting of belligerent attempts to win a war by wearing down the enemy to the point of collapse through continuous losses in personnel and materiel.
War of attrition almost certainly requires high continual casualty numbers, it's literally in the first sentence of the Wikipedia article:
> Attrition warfare is a military strategy consisting of belligerent attempts to win a war by wearing down the enemy to the point of collapse through continuous losses in personnel and materiel.