ine warfare in specified
zones.

_Feb. 3 United States severs diplomatic relations with Germany._

Feb. 24 Kut-el-Amara taken by British under Gen. Maude.

_Feb. 26 President Wilson asks authority to arm merchant ships._

_Feb. 28 "Zimmermann note" published._

Mar. 11 Bagdad captured by British under Gen. Maude.

Mar. 11-15 Revolution in Russia, leading to abdication of Czar
Nicholas II (Mar. 15). Provisional Government formed by
Constitutional Democrats under Prince Lvov.

_Mar. 12 United States announces that an armed guard will be placed
on all American merchant vessels sailing through the war
zone._

Mar. 17-19 Retirement of Germans to the "Hindenburg line" (page 118).

_Mar. 24 Minister Brand Whitlock and American Relief Commission
withdrawn from Belgium._

_Apr. 2 President Wilson asks Congress to declare the existence of
a state of war with Germany._

_Apr. 6 United States declares war on Germany._

_Apr. 8 Austria-Hungary severs diplomatic relations with the United
States._

Apr. 9- British successes in battle of Arras (Vimy Ridge taken
May 14 Apr. 9).

Apr. 16- French successes in battle of the Aisne between Soissons and
May 6 Rheims.

_Apr. 21 Turkey severs relations with United States._

_May 4 American destroyers begin cooeperation with British navy in
war zone._

May 15- Great Italian offensive on Isonzo front.
Sept. 15

May 15 Gen. Petain succeeds Gen. Nivelle as commander in chief of
the French armies.

_May 18 President Wilson signs selective service act._

June 7 British blow up Messines Ridge, south of Ypres, and capture
7,500 German prisoners.

June 10 Italian offensive in Trentino.

June 12 King Constantine of Greece forced to abdicate.

_June 26 First American troops reach France._

June 29 Greece enters war against Germany and her allies.

July 1 Russian army led in person by Kerensky, the Minister of War,
begins an offensive in Galicia, ending in disastrous retreat
(July 19-Aug. 3).

July 20 Kerensky succeeds Prince Lvov as premier of Russia.

July 30 Mutiny in German fleet at Wilhelmshaven and Kiel. Second
mutiny Sept. 2.

July 31- Battle of