18 February

1915 (Thursday)

 * Sharp fighting near Arras, in Champagne, near Verdun, and in Alsace.
 * French recover the Xon signal station and Norroy.
 * Germans take Tauroggen (north-east of Tilsit).
 * Austrians offensive on the River Dunajec near Tarnow.
 * German submarine "blockade" of Great Britain begins (see 4 February).