 Most of the county's paper mills closed in the years after 1870, and the last survivor shut in 1928.Gunpowder production fell victim to the First World War, which brought about a huge expansion of the British munitions industry, followed by sharp contraction and consolidation when the war ended, leading to the closure of the Surrey powder mills.New industrial developments included the establishment of the vehicle manufacturers Dennis Brothers in Guildford in 1895.