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1918 (MCMXVIII)was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1918th year of the Common Era (CE) and Anno Domini (AD) designations, the 918th year of the 2nd millennium, the 18th year of the 20th century, and the 9th year of the 1910s decade. As of the start of 1918, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.
Below, events of World War I have the "WWI" prefix.
- February 1 – Cattaro Mutiny: Austrian sailors in the Gulf of Cattaro (Kotor), led by two Czech Socialists, mutiny.
- February 5 – The SS Tuscania is torpedoed off the Irish coast; it is the first ship carrying American troops to Europe to be torpedoed and sunk.
- March 1 – WWI: German submarine U-19 sinks HMS Calgarian off Rathlin Island, Northern Ireland.
- March 3 – WWI: The Central Powers and Bolshevist Russia sign the Treaty of Brest-Litovsk, ending Russia's involvement in the war.
- March 6
- March 7 – WWI: Finland forms an alliance with Germany.
- March 8 – WWI: The Battle of Tell 'Asur is launched by units of the British Army's Egyptian Expeditionary Force against Ottoman defences from the Mediterranean Sea, across the Judaean Mountains to the edge of the Jordan Valley; it ends on March 12, with the move of much of the front line north into Ottoman territory.
- March 12 – Moscow becomes the capital of Soviet Russia.
- March 19 – The United States Congress establishes time zones, and approves daylight saving time (DST goes into effect on March 31).
- March 21–July 18 – WWI: The Spring Offensive by the German Army along the Western Front fails to make a breakthrough, despite large losses on each side, including nearly 20,000 British Army dead on the first day, Operation Michael.
- March 21 – WWI: The First Transjordan attack on Amman by units of the Egyptian Expeditionary Force begins, with the passage of the Jordan River.
- March 23
- WWI: The giant German cannon, the 'Paris Gun' (Kaiser Wilhelm Geschütz), begins to shell Paris from 114 km (71 mi) away.
- In London at the Wood Green Empire, Chung Ling Soo (William E. Robinson, U.S.-born magician) dies during his trick, where he is supposed to "catch" two separate bullets (but one of them perforates his lung). He dies the following morning in a hospital.
- March 25
- March 26 – Dr. Marie Stopes publishes her influential book Married Love in the U.K.
- March 27 – WWI: The First Battle of Amman is launched by units of the Egyptian Expeditionary Force, during the First Transjordan attack on Amman; it ends with their withdrawal on 31 March, back to the Jordan Valley.
- March 30 – March Days: Bolshevik and Armenian Revolutionary Federation forces suppress a Muslim revolt in Baku, Azerbaijan, resulting in up to 30,000 deaths.
- April 1 – The Royal Flying Corps and the Royal Naval Air Service in Britain are merged to form the Royal Air Force, the first autonomous Air Force in the world.
- April 5 – Sālote succeeds as Queen of Tonga; she will remain on the throne until her death in 1965.
- April 9 – Union of Bessarabia with Romania: Bessarabia votes to become part of the Kingdom of Romania.
- April 21 – WWI: Manfred von Richthofen, "The Red Baron", the war's most successful fighter pilot, dies in combat at Morlancourt Ridge near the Somme River.
- April 22 –Armenia, Azerbaijan, and Georgia declare their independence from Russia as the Transcaucasian Democratic Federative Republic.
- April 23 – WWI:
- April 28 – WWI: Gavrilo Princip, assassin of Archduke Franz Ferdinand of Austria, dies in Terezin, Austria-Hungary, after three years in prison.
- April 30 – WWI: The Second Transjordan attack on Shunet Nimrin and Es Salt, launched by units of the Egyptian Expeditionary Force, ends on 4 May, with their withdrawal back to the Jordan Valley.
- June – August – The "Spanish 'flu" becomes pandemic. Over 30 million people die in the following 6 months.
- June 1 – WWI: The Battle of Belleau Wood begins.
- June 4 – RMS Kenilworth Castle, one of the Union-Castle Line steamships, collides with her escort destroyer HMS Rival while trying to avoid her other escort, the cruiser HMS Kent.
- June 5 – The Afrikaner Broederbond, a confidential cultural organisation, is founded in Johannesburg.
- June 8 – V603 Aquilae, the brightest nova observed since Kepler's of 1604, is discovered.
- June 10 – WWI: The Austro-Hungarian dreadnought battleship SMS Szent István is sunk by two Italian MAS motor torpedo boats, off the Dalmatian coast.
- June 12
- Grand Duke Michael of Russia is murdered, thereby becoming the first of the Romanovs to be murdered by the Bolsheviks.
- WWI: The first airplane bombing raid by an American unit in France is carried out.
- June 16 – The Declaration to the Seven, a British government response to a memorandum issued anonymously by seven Syrian notables, is published.
- June 22 – Suspects in the Chicago Restaurant Poisonings are arrested, and more than 100 waiters are taken into custody, for poisoning restaurant customers with a lethal powder called Mickey Finn.
- July 3 – Allied intervention in the Russian Civil War: The Siberian Intervention is launched by the Allies, to extract the Czechoslovak Legion from the Russian Civil War.
- July 4 – Mehmed VI succeeds as Sultan of the Ottoman Empire on the death of his half-brother Mehmed V (Reşâd, who has reigned since 1909), himself reigning until the Sultanate is abolished in 1922.
- July 9 – Great Train Wreck of 1918: in Nashville, Tennessee, an inbound local train collides with an outbound express, killing 101.
- July 12 – The Imperial Japanese Navy battleship Kawachi blows up off Tokuyama, Yamaguchi, western Honshu, Japan, killing at least 621.
- July 13 – The National Czechoslovak Committee is established.
- July 14 – The film The Glorious Adventure is released in the United States, featuring Mammy Lou, who becomes one of the oldest people ever to star in a film, at a claimed age of 114.
- July 15 – WWI: Second Battle of the Marne: The battle begins near the River Marne, with a German attack.
- July 17
- WWI: RMS Carpathia (famed for rescuing survivors of the RMS Titanic) is torpedoed and sunk off the east coast of Ireland, by Imperial German Navy submarine U-55; 218 of the 223 on board are rescued.
- Execution of the Romanov family: By order of the Bolshevik Party, and carried out by the Cheka, former emperor Nicholas II, his wife Alexandra Feodorovna, their children, Olga, Tatiana, Maria, Anastasia, Alexei and retainers are shot at the Ipatiev House, in Ekaterinburg, Russia.
: Attempted assassination of Lenin
, depicted by Vladimir Pchelin
Flag of the Kingdom of Serbs, Croats and Slovenes
- December 4 – President Woodrow Wilson departs by ship to the Paris Peace Conference, becoming the first United States President to travel to Europe while holding office.
- December 5 – Estonian War of Independence: The British light cruiser HMS Cassandra strikes a mine and sinks near Saaremaa in the Baltic Sea, killing 11 sailors.
- December 14
- December 16 – Vincas Mickevičius-Kapsukas declares the formation of the Lithuanian Soviet Socialist Republic, a puppet state created by the Russian SFSR to justify the Lithuanian–Soviet War.
- December 17 – Darwin Rebellion in Australia: Disaffected workers march on Government House, Darwin, demanding the resignation of the Administrator of the Northern Territory, John A. Gilruth.
- December 20 – Tomáš Garrigue Masaryk returns to the Czechoslovak Republic.
- December 21 – Estonian War of Independence: The Red Army captures Tartu, Estonia.
- December 27 – Greater Poland Uprising (1918–19): Poles in Greater Poland (the former Grand Duchy of Posen) rise up against the Germans, ignited by a patriotic speech made in Poznań by pianist and politician Ignacy Jan Paderewski.
- December 28 – Sinn Féin enjoys a landslide victory in Irish seats in the Irish general election (part of the 1918 United Kingdom general election), following the counting of votes, winning 73 of the 105 seats in Ireland. In accordance with their manifesto, Sinn Féin members will not take their seats in the Palace of Westminster but will form the First Dáil in Dublin. Countess Constance Markievicz, while detained in Holloway Prison (London), becomes the first woman elected to (but does not take her seat in) the British House of Commons.
- December 31 – A British-brokered ceasefire ends the two weeks of fighting in the Georgian–Armenian War.