From 28th July 1914 until 11th November 1918 a global war was fought, centred in Europe, known as the World War or the Great War. In America it was initially called the European War. On the approach to the Second World War, the Great War became known as the First World War, World War I (WWI or WW1).
The war cost nearly 9 million lives and nearly 30 million casualties or missing on both sides.

Key dates in this compilation:

Battle of Ypres Oct/Nov 1914
David joined up December 1915
Battle of Somme July/Nov 1916
Battle of Arras April/May 1917
Battle of Nieuport Bains 10th July 1917
David is PoW 10th July 1917 til 11th Nov 1918
David home to Balham in London 19th Dec 1918
David demobilised 28th March 1919