With a population of 4.8 million in 1911, Scotland sent 690,000 men to the war, of whom 74,000 died in combat or from disease, and 150,000 were seriously wounded.[147][148] At times Scottish troops made up large proportions of the active combatants, and suffered corresponding loses, as at the Battle of Loos, where there were three full Scots divisions and other Scottish units.[64] Thus, although Scots were only 10 per cent of the British population, they made up 15 per cent of the national armed forces and eventually accounted for 20 per cent of the dead.[149] Some areas, like the thinly populated Island of Lewis and Harris suffered some of the highest proportional losses of any part of Britain.[64] Clydeside shipyards and the engineering shops of west-central Scotland became the most significant centre of shipbuilding and arms production in the Empire. In the Lowlands, particularly Glasgow, poor working and living conditions led to industrial and political unrest.[149]