Situated in Fields close to St Ouen's Church and Scout hall. The Observation position was built on St Ouen's Mill and some of the ammunition shelters were been modified as nuclear monitoring stations for the cold war. There were three Anti-Aircraft weapons (3.7c, Flak 37) and three 21 cm Mörser 18 guns in open emplacements. Some of the emplacements can still been seen today. The Batterie was manned by 130 soldiers.
3 x 21 cm Mörser 18
Number built: 711+
Weight: 16,700 kg (36,817 lbs)
Barrel length: 6.51 m (21 ft 4 in) L/30
Shell: separate-loading cased ammunition (6 charges)
Shell weight: 113 kg (249 lb) (HE)
Caliber: 211 mm (8.30 in)
Breech: horizontal sliding block
Recoil: dual-recoil hydropneumatic
Carriage: box trail
Elevation: -6° to +70°
Traverse: 16° on wheels / 360° onplatform
Muzzle velocity: 550 m/s (1,804 ft/s)
Effective firing range: 11miles
The forward observation position was located in St Ouen’s Mill.