Object Title

4.5 in mortar and bed - Coehorn Mortar

4.5 in mortar and bed - Coehorn Mortar



Object Number



From Berlin, 1963, with Nos XIX.240 and 241. Probably from the Zeughaus, Berlin. (A small plaque on the mortar bears the inventory(?) number AB 6986).

Physical Description

The reinforce bears the monogram of George II in slight relief. The right trunnion is engraved with the registered number 230 and the left with the weight 0-3-7. The foundry number 79 is stamped on the under side of the breech. Bed, which is a modern replica, is of a plain wooden rectangular construction with four iron carrying handles, two either side. The trunnions are held by simple metal strips.


Dimensions: Length: 13.5in (34 cm), Diameter chamber: 2in (5 cm), Bed length: 23.75 in (60.3 cm), Bed width: 9.37 in (23.7 cm) Weight: 3 qtr 7 lb (41.3 kg)


Serial Number 230


4.5 in _ (11.5 cm)


Bibliographic References

H.L.Blackmore, The Armouries of the Tower of London, Ordnance Catalogue, H.M.S.O. London 1976, p.98-99.


In 1713 the first Cohorn mortars appear and in 1726 Royal mortars are listed as well. The Cohorn mortar was the smallest of the standard mortars and was named after its inventor the Dutch military engineer Baron Menno van Cohorn (or Coehorn), 1641-1704. Known as the Dutch Vauban he was renowned mainly for his methods of siegecraft and fortification. His mortars were first used at the siege of Grave in 1674.