21 February

1915 (Sunday)

 * German aeroplane drops bombs at Colchester and other places in Essex. There are no recorded civilian casualties and no damage. See Air Raids on Great Britain in 1915.
 * French progress north of Perthes.
 * Germans take Hochrod and Stossweiler (Alsace).
 * Successful Russian counter-attacks near Lomja and Plotsk.
 * Russians carry heights near Lupkow and Wyzskow Passes, and make successful attack on Austrians south-east of Stanislau.
 * Turks driven across River Ichkalen (Armenia).