1914

June 28--Archduke Francis Ferdinand was assassinated.
July 28--Austria-Hungary declared war on Serbia.
July 30--Russia ordered general mobilization.
Aug. 1--Germany declared war on Russia.
Aug. 3--Germany declared war on France.
Aug. 4--Germany invaded Belgium. Great Britain declared war on Germany.
Aug. 26-31--The Germans crushed the Russian Second Army at Tannenberg.
Sept. 1-Oct. 3--The Russians defeated the Austrians in the Battles of Lemberg.
Sept. 6-9--The Allies stopped the Germans in the First Battle of the Marne.
Oct. 21-Nov. 17--Germany failed to reach the English Channel in the First Battle of Ypres.
Oct. 29--The Turks joined the Central Powers.

1915

Feb. 18--Germany started to blockade Great Britain.
Apr. 22--The Germans first used poison gas, in the Second Battle of Ypres.
Apr. 25--Allied troops landed on the Gallipoli Peninsula.
May 2--The Austrians began an offensive in Galicia.
May 7--A German submarine sank the liner Lusitania.
May 23--Italy declared war on Austria-Hungary.

1916

Feb. 21--The Germans opened the Battle of Verdun.
Apr. 29--Kut-al-Amara (Al Kut), with 10,000 British troops, surrendered to the Turks.
May 31-June 1--The British fleet fought the German fleet in the Battle of Jutland.
June 4--Russia began an offensive in eastern Galicia.
July 1-Nov. 18--The Allies advanced in the Battles of the Somme.
Aug. 27--Italy declared war on Germany.
Sept. 15--The British army first used tanks.

1917

Feb. 1--Germany began unrestricted submarine warfare.
Apr. 6--The United States declared war on Germany.
June 26--American troops began landing in France.
July 31-Aug. 9--Germany ended Russia's last offensive.
July 31-Nov. 10--Germany stopped the Allies in the Third Battle of Ypres.
Nov. 7--The Bolsheviks seized power in Russia.
Dec. 9--Jerusalem fell to the Allies.
Dec. 15--Russia signed an armistice with Germany.

1918

Jan. 8--President Woodrow Wilson announced his Fourteen Points as the basis for peace.
Mar. 3--Russia signed the Treaty of Brest-Litovsk.
Mar. 21--Germany launched the firstof its final offensives along the Somme.
Apr. 9--Germany launched an offensive at Ypres.
May 27--Germany launched an offensive on the Aisne.
June 15--Austria-Hungary fought its last offensive.
June 23--The Allies occupied Murmansk, Russia.
June 25--American marines captured Belleau Wood.
July 15--Germany launched its last offensive on the Marne.
July 18--France began the Second Battle of the Marne.
July 21--Allied troops recaptured Château-Thierry.
Aug. 8--The British broke the German line at Amiens.
Sept. 26--The Allies began their final offensive on the western front.
Sept. 29--Bulgaria signed an armistice.
Oct. 30--The Ottoman Empire signed an armistice.
Nov. 3--Austria signed an armistice.
Nov. 9--Kaiser Wilhelm II of Germany abdicated.
Nov. 11--Germany signed the armistice.