the ira developed home-made mortars referred to as "barrack-busters". normally fixed to the back of a commercial vehicle such as a builder's lorry, the vehicle would be parked in position near a barracks and the devices fired by timing device or remote controlled sending missiles made from gas cylinders into the barracks compound. the largest of these was twelve tubes fired at 3 udr's kilkeel base "the abbey" in 1992. bases were also attacked in other ways such as the truck bomb which destroyed 2 udr's glenanne barracks killing three soldiers and wounding many more.