Sometimes called a trush. You send villagers to the opponent’s base early in the Feudal Age and build Watch Towers on or next to their gold, stone or woodline. Garrisoned villagers make the tower shoot more arrows.
It costs a lot of stone and leaves your own economy short of villagers, so it either wins early or leaves you behind. The usual defence is to pull villagers to build your own tower or wall away from it, then switch to resources the tower cannot reach.