sentences:  Approximately one third of the city's factories were completely destroyed or severely damaged, another third were badly damaged, and the rest suffered slight damage.Among the destroyed factories were the main Daimler factory, the Humber Hillman factory, the Alfred Herbert Ltd machine tool works, nine aircraft factories, and two naval ordnance stores.However, the effects on war production were only temporary, as much essential war production had already been moved to 'shadow factories' on the city outskirts.