Apr. 17-May 17--Second Battle of Ypres. British captured Hill 60 (April 19); (April 23); Germans advanced toward Yser Ca.n.a.l. Asphyxiating gas employed by the Germans. Failure of Germany to break through the British lines.

Apr. 22--German emba.s.sy sends out a warning against embarkation on vessels belonging to Great Britain.

Apr. 26--Allied troops land on the Gallipoli Peninsula.

Apr. 28--American vessel "Cushing" attacked by German aeroplane.

Apr. 30--Germans invade the Baltic Provinces of Russia.

May 1--American steamship "Gulflight" sunk by German submarine; two Americans lost. Warning of German emba.s.sy published in daily papers.

May 2--Russians forced by the combined Germans and Austrians to retire from their positions in the Carpathians (Battle of the Dunajec).

May 7--Cunard line steamship "Lusitania" sunk by German submarine (1,154 lives lost, 114 being Americans).

May 8--Germans occupy Libau, Russian port on the Baltic.

May 9-June--Battle of Artois, or Festubert (near La Ba.s.see).

May 10--Message of sympathy from Germany on loss of American lives by sinking of "Lusitania."

May 12--South African troops under Gen. Botha occupy capital of German Southwest Africa.

May 13--American note protests against submarine policy culminating in the sinking of the "Lusitania."

May 23--Italy declared war on Austria-Hungary.

May 25--Coalition cabinet formed in Great Britain; Asquith continues to be Prime Minister.

May 25--American steamship "Nebraskan" attacked by submarine.

May 28--Germany's answer to American note of May 13.

June 1--Supplementary note from Germany in regard to the "Gulflight" and "Cushing."

June 3--Przemysl retaken by Germans and Austrians.

June 8--Resignation of William J. Bryan, Secretary of State.

June 9--Monfalcone occupied by Italians, severing one of two railway lines to Trieste.

June 9--United States sends second note on "Lusitania" case.

June 22--The Austro-Germans recapture Lemberg.

July 2--Naval action between Russian and German warships in the Baltic.

July 8--Germany sends reply to note of June 9 and pledges safety to United States vessels in war zone under specified conditions.

July 15--Germany sends memorandum acknowledging submarine attack on "Nebraskan" and expresses regret.

July 15--Conquest of German Southwest Africa completed.

July 21--Third American note on "Lusitania" case declares Germany's communication of July 8 "very unsatisfactory."

July 12-Sept. 18--German conquest of Russian Poland. Germans capture Lublin (July 31), Warsaw (Aug. 4), Ivangorod (Aug. 5), Kovno (Aug. 17), Novo-georgievsk (Aug. 19), Brest-Litovsk (Aug. 25), Vilna (Sept. 18).

July 25--American steamship "Leelanaw" sunk by submarines; carrying contraband; no lives lost.

Aug. 4--Capture of Warsaw by Germans.

Aug. 19--White Star liner "Arabic" sunk by submarine; 16 victims, 2 Americans.

Aug. 20--Italy declared war on Turkey.

Aug. 24--German amba.s.sador sends note in regard to "Arabic." Loss of American lives contrary to intention of the German Government and is deeply regretted.

Sept. 1--Letter from Amba.s.sador von Bernstorff to Secretary Lansing giving a.s.surance that German submarines will sink no more liners without warning. Endorsed by the German Foreign Office (Sept. 14).

Sept. 4--Allan liner "Hesperian" sunk by German submarine; 26 lives lost, 1 American.

Sept. 7--German Government sends report on the sinking of the "Arabic."

Sept. 8--United States demands recall of Austro-Hungarian amba.s.sador, Dr. Dumba.

Sept. 14--United States sends summary of evidence in regard to "Arabic."

Sept. 18--Fall of Vilna; end of Russian retreat.

Sept. 25-Oct.--French offensive in Champagne fails to break through German lines.

Sept. 27--British progress in the neighborhood of Loos.

Oct. 4--Russian ultimatum to Bulgaria.

Oct. 5--Allied forces land at Saloniki, at the invitation of the Greek Government.

Oct. 5--German Government regrets and disavows sinking of "Arabic" and is prepared to pay indemnities.

Oct. 6-Dec. 2--Austro-German-Bulgarian conquest of Serbia. Fall of Nish (Nov. 5), of Prizrend (Nov. 30), of Monastir (Dec. 2).

Oct. 14--Great Britain declared war against Bulgaria.

Nov. 10--Russian forces advance on Teheran as a result of pro-German activities in Persia.

Dec. 1--British under Gen. Townshend forced to retreat from Ctesiphon to Kut-el-Amara.

Dec. 4--United States Government demands recall of Capt. Karl Boy-Ed, German naval attache, and Capt. Franz von Papen, military attache.