| Dates | Events |
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| June 28
| The Assassination in Sarajevo: Attempt at Sarajevo, Bosnia, on Archduke Franz Ferdinand, heir presumptive to the Austro-Hungarian throne, who is killed along with his wife, Archduchess Sophie.
| Details
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| July 23
| Austria-Hungary sends an ultimatum to Serbia. Serbia, counting on Russian support, rejects some points of the ultimatum and mobilizes.
| Details
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| July 28
| Austria-Hungary declares war on Serbia. Russia mobilizes. The Great War begins.
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| July 31
| Germany enjoins Russia to stop mobilizing. Russia says mobilization is against Austria-Hungary only.
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| August 1
| Germany declares war on Russia and mobilizes.
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Italy declares her neutrality.
Germany and the Ottoman Empire sign a secret alliance treaty.
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| August 2
| Germany invades Luxembourg.
| Details
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| August 3
| Germany declares war on France and invades Belgium to outflank the French army.
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| Britain protests for the violation of Belgian neutrality, guaranteed by a treaty; German Chancellor replies that the latter is just a chiffon de papier (a scrap of paper).
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| August 4
| The United Kingdom declares war on Germany.
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| August 5
| Montenegro declares war on Austria-Hungary.
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| The Ottoman Empire closes the Dardanelles.
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| August 5–August 16
| The Germans siege and then capture the fortresses of Liège, Belgium.
| Details
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| August 6
| Austria-Hungary declares war on Russia.
Serbia declares war on Germany.
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| August 7
| The British Expeditionary Force arrives in France.
| Details
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| August 9
| Montenegro declares war on Germany.
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| August 11
| France declares war on Austria-Hungary.
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| August 12
| The United Kingdom declares war on Austria-Hungary.
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| August 14–August 24
| Battle of the Frontiers. The Germans obtain a victory against the British Expeditionary Force and France's Fifth Army.
| Details
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| August 16–August 19
| The Serbs defeat the Austro-Hungarians at the Battle of Cer.
| Details
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| August 17
| The Russian army enters East Prussia. Battle of Stalluponen.
| Details
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| August 20
| The Germans attack the Russians in East Prussia. The attack is a failure in addition to being a violation of the Schlieffen Plan.
| Details
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| August 17–September 2
| Battle of Tannenberg: the Russian army undergoes a heavy defeat by the Germans.
| Details
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| August 20
| The Germans occupy Brussels.
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| August 22
| Austria-Hungary declares war on Belgium.
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| August 23
| Japan declares war on Germany.
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| August 23–August 25
| Battle of Krasnik. The Austro-Hungarian First Army defeats the Russian Fourth Army
| Details
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| August 24–September 7
| The Germans siege and capture the Maubeuge Fortress.
| Details
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| August 25
| Japan declares war on Austria-Hungary.
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| August 26
| British and French forces invade Togoland, a German protectorate in West Africa.
| Details
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| August 26–August 27
| Battle of Le Cateau. Allied retreat.
| Details
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| August 26–September 11
| Battle of Lemberg. The Russians capture Lviv.
| Details
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| August 27–November 7
| Battle of Tsingtao: British and Japanese forces capture the German-controlled port of Tsingtao in China.
| Details
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| August 28
| The Royal Navy wins the First Battle of Heligoland Bight, North Sea.
| Details
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| August 29–August 30
| Battle of Saint Quentin, aka Battle of Guise. Orderly Allied retreat.
| Details
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| August 30
| New Zealand occupies German Samoa (later Western Samoa).
| Details
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| September 3–September 11
| Austro-Hungarian defeat at the Battle of Rava Russka.
| Details
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| September 5–September 12
| First Battle of the Marne. The German advance on Paris is halted, marking the failure of the Schlieffen Plan.
| Details
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| September 7–September 14
| First Battle of the Masurian Lakes: The Russian Army of the Neman withdraws from East Prussia with heavy casualties.
| Details
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| September 8–September 17
| Second Austro-Hungarian attempt at invading Serbia fails.
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| September 9
| Theobald von Bethmann Hollweg lays out Germany's war aims.
| Details
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| September 11–September 21
| Australian forces occupy German New Guinea.
| Details
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| September 13
| South African troops begins invading German South-West Africa.
| Details
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| September 13–September 28
| The First Battle of the Aisne ends in a substantial draw. The Race to the Sea begins.
| Details
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| September 14
| Erich von Falkenhayn replaces Helmuth von Moltke the Younger as German Chief of Staff.
| Details
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| September 17
| The Siege of Przemyśl begins
| Details
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| September 28–October 10
| The Germans siege and capture Antwerp, Belgium.
| Details
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| September 29–October 31
| Battle of the Vistula, aka Battle of Warsaw.
| Details
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| October 16–October 31
| Battle of the Yser. French and Belgian forces secure the coastline of Belgium.
| Details
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| October 19–November 22
| The First Battle of Ypres ends the Race to the Sea. The Germans are prevented from reaching Calais and Dunkirk.
| Details
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| November 1
| Russia declares war on the Ottoman Empire.
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| Battle of Coronel. Von Spee's German cruiser squadron defeats a Royal Navy squadron under Christopher Cradock.
| Details
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| November 2
| The United Kingdom begins the naval blockade of Germany.
| Details
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| November 3
| Montenegro declares war on the Ottoman Empire.
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| November 3–November 5
| Von Lettow-Vorbeck's German colonial forces defeat the British at the Battle of Tanga, German East Africa.
| Details
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| November 5
| France and the United Kingdom declare war on the Ottoman Empire.
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| November 6
| The Austro-Hungarians enter Belgrade.
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| November 9
| Battle of Cocos, northeast Indian Ocean. The Australian cruiser Sydney destroys the German cruiser Emden.
| Details
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| November 11–December 6
| Battle of Łódź (Lviv).
| Details
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| December 3–December 15
| Battle of Kolubara. The Serbs take Belgrade back.
| Details
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| December 8
| Battle of the Falklands. Von Spee's German cruiser squadron is defeated by the Royal Navy.
| Details
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| December 16
| The German fleet shells Scarborough and Hartlepool, England.
| Details
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| December 29–January 2 1915
| The Russians win the Battle of Sarikamis, Caucasia.
| Details
|
| Dates | Events |
|
| January 2
| The Russian offensive in the Carpathians begins. It will continue until April 12.
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| January 19
| First Zeppelin raid on Great Britain.
| Details
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| January 24
| Battle of Dogger Bank between squadrons of the British Grand Fleet and the German Hochseeflotte.
| Details
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| January 28–February 3
| The Ottomans fail to capture the Suez Canal.
| Details
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| February 4
| Germany begins submarine warfare against merchant vessels.
| Details
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| February 7–February 22
| Second Battle of the Masurian Lakes. The Russian X Army is defeated.
| Details
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| February 19
| British and French naval attack on the Dardanelles. The Gallipoli Campaign begins.
| Details
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| March 10–March 13
| Battle of Neuve Chapelle. After an initial success, a British offensive is halted.
| Details
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| March 22
| The Siege of Przemyśl ends. The Russians capture the fortress.
| Details
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| April 22–May 25
| At the Second Battle of Ypres, the Germans use chemical weapons (gas) for the first time.
| Details
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| April 25
| Allied forces land on Gallipoli.
| Details
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| London Pact between the Entente and Italy.
| Details
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| April 28
| First Battle of Krithia. The Allied advance is repelled.
| Details
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| May 1–May 3
| Battle of Gorlice-Tarnów: the German troops under General Mackensen break through the Russian lines in Galicia.
| Details
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| May 6–May 8
| Second Battle of Krithia. The Allied attempts at advancing are thwarted again.
| Details
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| May 7
| The British liner Lusitania is sunk by a German U-boat.
| Details
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| May 10
| The Hungarians rout the Russians at Jaroslaw. Lviv is again in Austrian hands.
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| May 12
| Windhoek, capital of German South-West Africa, is occupied by South African troops.
| Details
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| May 23
| Italy declares war on Austria-Hungary.
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| June 4
| Third Battle of Krithia. Yet another Allied failure.
| Details
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| The Russians leave Przemyśl.
| Details
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| June 22
| Mackensen breaks again through the Russian lines in the Lviv area.
| Details
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| June 23–July 7
| First Battle of the Isonzo.
| Details
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| June 27
| The Austro-Hungarians re-enter Lviv.
| Details
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| June 28–July 5
| The British win the Battle of Gully Ravine.
| Details
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| July 9
| The German forces in South-West Africa surrender.
| Details
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| July 18–August 3
| Second Battle of the Isonzo.
| Details
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| August 5
| The Germans occupy Warsaw.
| Details
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| August 6–August 29
| Battle of Sari Bair, aka the August Offensive. Last and unsuccessful attempt by the British to seize the Gallipoli peninsula.
| Details
|
| September 1
| Germany suspends unrestricted submarine warfare.
| Details
|
| September 8
| Nicholas II removes Grand Duke Nicholas Nikolayevich as Commander-in-Chief of the Russian Army, personally taking that position.
| Details
|
| September 19
| The Germans occupy Vilnius. The Gorlice-Tarnów Offensive ends.
| Details
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| September 25–September 28
| Battle of Loos. A British major offensive fails.
| Details
|
| October 6
| Serbia is invaded by Germany, Austria-Hungary and Bulgaria.
| Details
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| October 14
| Bulgaria declares war on Serbia
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| October 15
| The United Kingdom declares war on Bulgaria.
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| October 16
| France declares war on Bulgaria.
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| October 18–November 4
| Third Battle of the Isonzo
| Details
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| October 19
| Italy and Russia declare war on Bulgaria.
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| October 27
| A French army lands in Salonika and, with the help of British and Italian troops, sets up a Balkan Front.
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| November 10–December 2
| Fourth Battle of the Isonzo
| Details
|
| November 22–November 25
| Battle of Ctesiphon, in present-day Iraq.
| Details
|
| November 27
| The Serbian army collapses. It will retreat to the Adriatic Sea and be evacuated by the Italian and French Navies.
| Details
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| December 7
| The siege of Kut, Mesopotamia, by the Ottomans begins.
| Details
|
| December 19
| Douglas Haig replaces John French as commander of the British Expeditionary Force.
| Details
|
| Dates | Events |
|
| January 8
| Woodrow Wilson outlines his Fourteen Points.
| Details
|
| February 18
| Fighting resumes on the Eastern Front.
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| February 21
| The British capture Jericho.
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| February 25
| German troops capture Estonia.
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| March 3
| At Brest-Litovsk, Leon Trotsky signs the peace treaty with Germany.
| Details
|
| March 21–March 25
| First phase of the Spring Offensive (Operation Michael). The Germans obtain a Pyrrhic victory.
| Details
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| March 23–August 7
| Artillery bombardment of Paris.
| Details
|
| March 26
| French Marshall Ferdinand Foch is appointed Supreme Commander of all Allied forces.
| Details
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| April 4–April 30
| Second phase of the Spring Offensive (Operation Georgette). The results are disappointing for the Germans.
| Details
|
| May 7
| Treaty of Bucharest between Romania and the Central Powers. It will never be ratified.
| Details
|
| May 27–June 6
| Third Battle of the Aisne (aka Operation Blucher-Yorck, third phase of the Spring Offensive). After initial gains, the German advance is halted.
| Details
|
| June 9–June 12
| Final phase of the Spring Offensive (Operation Gneiseau). Although substantial territorial gains, the Germans do not achieve their strategic goals
| Details
|
| June 13–June 23
| Second Battle of the Piave: the Austro-Hungarian offensive is repelled.
| Details
|
| July 15–August 5
| Second Battle of the Marne and last German offensive on the Western Front, which fails when the Germans are counterattacked by the French.
| Details
|
| August 8–August 11
| Battle of Amiens, first phase of the Hundred Days Offensive.
| Details
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| September 12
| Battle of Havrincourt, a phase of the Hundred Days Offensive.
| Details
|
| September 18–September 19
| Battle of Doiran, The Bulgarians halt the British and Greek advance.
| Details
|
| September 18–October 10
| Battle of the Hindenburg Line, a phase of the Hundred Days Offensive. The Allies break through the German lines.
| Details
|
| September 19–September 21
| Battle of Megiddo. The British conquer Palestine.
| Details
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| September 26–November 11
| Meuse-Argonne Offensive, the final phase of the Hundred Days Offensive and of World War One.
| Details
|
| September 29
| The Allies break through the Bulgarian lines at Dobro Polje.
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| September 30
| Bulgaria signs an armistice with the Allies.
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| October 1
| The British enter Damascus.
| Details
|
| October 20
| Germany suspends submarine warfare.
| Details
|
| October 24–November 4
| Battle of Vittorio Veneto. The Austro-Hungarian army is routed. The Italians enter Trent and land at Triest.
| Details
|
| October 29
| Wilhelm Groener replaces Erich Ludendorff as Hindenburg's deputy.
| Details
|
| October 29
| Germany's Hochseeflotte mutinies.
| Details
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| October 30
| The Ottoman Empire signs the Armistice of Mudros.
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| November 3
| Austria-Hungary signs the armistice with Italy, effective November 4.
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| November 9
| Germany: Kaiser William II abdicates; republic proclaimed.
| Details
|
| November 10
| Austria-Hungary: Kaiser Charles I abdicates.
| Details
|
| November 11
| At 6 am, Germany signs the Armistice of Compiègne. End of fightings at 11 a.m..
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| November 12
| Austria proclaimed a republic.
|
|
| November 14
| Czechoslovakia proclaimed a republic.
| Details
|
| German U-boats interned.
|
|
| 3 days after the armistice, fighting ends in the East African theater when General von Lettow-Vorbeck agrees a cease-fire on hearing of Germany's surrender.
| Details
|
| November 21
| Germany's Hochseeflotte surrendered to the United Kingdom.
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| November 22
| The Germans evacuate Luxembourg.
|
|
| November 23
| 9 days after agreeing a cease-fire, General von Lettow-Vorbeck formally surrenders his undefeated army at Abercorn in present-day Zambia.
| Details
|
| November 27
| The Germans evacuate Belgium.
|
|
| December 1
| Yugoslav independence proclaimed.
| Details
|
ko:제1차 세계 대전 연표
he:לוח אירועים של מלחמת העולם הראשונה
pt:Cronologia da Primeira Guerra Mundial
ru:Хронология Первой мировой войны
sl:Kronologija prve svetovne vojne
sr:Хронологија Првог светског рата
sh:Kronologija Prvog svetskog rata
