Cuba declares war against Germany.
Two German destroyers are torpedoed off Zeebrugge, one of them being sunk.
The British torpedo gunboat Jason is sunk by a mine off the west coast of Scotland.
April 8 (Easter Sunday)
Austria breaks off diplomatic relations with the United States.
Mesopotamia:—The British capture Belad Station, and occupy the left bank of the Shatt-el-Adhaim.
April 9 (Mon.)
Brazil breaks off diplomatic relations with Germany.
The First Battle of Arras begins: the British advance on a fifteen-mile front between Lens and Arras, and capture the Vimy Ridge with 6000 prisoners (see May 16). On the Bapaume-Cambrai road they take Deniécourt and Havrincourt Wood, and, north of St. Quentin, Fresnoy-le-Petit, Pontru, and Le Vergnier.