"high wooden towers" . "sow" . "siege tower" . . "siege structure" . "towers" . "belfries" . "siege towers" . "battery-tower" . . "Siege towers" . . . "belfry" . . "Siege tower" . . . "mobile assault towers" . . . . . "Siege tower" . . . . . "wooden siege towers" . . . "Belfry" . "Sow" .