"trench raiders" . "raids" . "raid" . "trench raiding" . . . "Trench raids" . "nighttime trench raid" . . "Raiding" . . "raiding parties" . . "trench raid" . "Trench raiding" . . "large scale trench raids" . "trench raids" . "night raid" . "Trench raiding" . "raiding" .