ordnance

n. [ From OE. ordenance, referring orig. to the bore or size of the cannon. See Ordinance. ] Heavy weapons of warfare; cannon, or great guns, mortars, and howitzers; artillery; sometimes, a general term for all weapons, ammunitiion, and appliances used in war. [ 1913 Webster ]

All the battlements their ordnance fire. Shak. [ 1913 Webster ]

Then you may hear afar off the awful roar of his [ Rufus Choate's ] rifled ordnance. E. Everett. [ 1913 Webster ]

Ordnance survey, the official survey of Great Britain and Ireland, conducted by the ordnance department. [ 1913 Webster ]