1 | 1917 | - 1917—1917: Battle of Cambrai - first use of massed tanks, but effect more psychological than actual
- 1917—1917: Ministry of Labour is established in Britain
- Feb 1917—Feb 1917: February revolution in Russia; Tsar Nicholas abdicates
- 16 Apr 1917—16 Apr 1917: Lenin returns to Russia after exile
- 17 Apr 1917—17 Apr 1917: USA declares war on Germany
- 26 May 1917—26 May 1917: George V changes surname from Saxe-Coburg-Gotha to Windsor (Royal
proclamation on 17 July)
- Jul 1917—Jul 1917: Battle of Passchendaele - little gained by either side (Jul-Nov)
- 7 Nov 1917—7 Nov 1917: 'October' Revolution in Russia - Bolsheviks overthrow provisional government;
Lenin becomes Chief Commissar
- 6 Dec 1917—6 Dec 1917: Halifax (Nova Scotia) Explosion, one of the world's largest artificial non-nuclear
explosions to date: a ship loaded with wartime explosives blew up after a collision,
obliterating buildings and structures within two square kilometres of the explosion
- 9 Dec 1917—9 Dec 1917: British forces capture Jerusalem
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