Shooting 21 centimeter mortars with balloon observation on the Western Front

Preparations for the ascent of the captive balloon; observation officer fastens the parachute belt and climbs into the basket; orientation at the map board; checking the field telephone connection; ascent of the balloon; observation of the enemy terrain; transmission of the observation to the mortar battery; mortar in camouflaged positions is prepared for operation, loading and firing; transmissio…