9th West Yorkshires in training at Mansfield; England; in preparation for trench warfare. Opens with shot of field with barracks in distance. Boom! Suddenly an explosion on the ground. Shot of two British soldiers standing in low trench; lighting a bomb or grenade or whatever; and then throwing it. Shot of soldier throwing another; pan to explosion. And another; same. Next; the two men working on catapult set up in the trench; pulling back spring mechanism with bomb in it; letting it go; launching bomb. Weapons. World War One. Military.