22 April

1915 (Thursday)

 * Second Battle of Ypres begins: town of Ypres largely destroyed; German advance checked by Canadians after French retreat (see 22 November 1914 and 25 May 1915).
 * First German poison gas attack on the Western Front (see 14 April).
 * Progress by the French near St. Mihiel.
 * Russian attacks repulsed on both sides of the Uzsok Pass.
 * Austrian attack towards Styrj fails.
 * Anglo-French force landed at Enos.
 * Resumed bombardment of the forts at Smyrna.
 * British Admiralty suspends passenger traffic between England and Holland.