4 May

1915 (Tuesday)

 * Second Battle of Ypres: French advance between Lizerne and Het Sas; Germans capture Zonnebeke, Wetshoek and Zevenkote.
 * Battle of St. Julien ends (see 24 April).
 * Severe fighting in Galicia: Russians stand on the Visloka River.
 * Dardanelles: British failure at Gaba Tepe.
 * Budget estimated expenditure £1,132,654,000 introduced by Mr. Lloyd George.