January 8th: Battle of Soissons started.
January 14th: Battle of Soissons ended after the Germans launched a successful counter-attack against the French.
January 15th: The War Council authorised a naval attack on the Dardanelles.
January 19th: The first Zeppelin raid on Great Britain took place at Great Yarmouth.
January 24th: Battle of Dogger Bank between Royal Navy and the German Navy.
January 31st: The first recognised use of poison gas took place at Bolimov on the Vistula Front.
February 3rd: Unsuccessful attacks on the Suez Canal by the Turks.
February 4th: Germany declared the waters around Great Britain to be a ‘war zone’.
February 19th: British troops bombarded Turkish forts in the Dardanelles. Small number of Marines landed.
February 24th: A decision was taken that if the Navy could not defeat the defenders at the Dardanelles, then the task would be finished by the Army.
March 10th: The British Army launched an offensive at Neuve Chapelle.
March 13th: Mediterranean Expeditionary Force sailed from Egypt. Battle of Neuve Chapelle was ended.
March 18th: An Anglo-French force that involved 16 battleships attacked the Dardanelles but suffered heavy losses.
March 22nd: Army and Navy commanders agreed on a joint offensive. Two Zeppelins attacked Paris.
April 11th: British forces led by Sir John Nixon repel a Turkish attack on Basra.
April 22nd: First use of chlorine gas at the start of the Second Battle of Ypres.
April 25th: Allied troops landed at five beaches at Gallipoli and gained a small beachhead at Anzac Cove.
April 26th: A secret treaty between the Triple Entente and Italy brought Italy into the war on the side of the Allies.
May 1st: First American merchant ship sunk by Germans, the ‘Gulflight’, a tanker, off the Scilly Islands.
May 3rd: Italy denounced the Triple Alliance.
May 7th: The ‘Lusitania’ was sunk by a German U-boat; 1,201 lives were lost including 128 Americans.
May 9th: France launched a Spring Offensive in Artois and advanced towards Vimy Ridge.
May 19th: The Turks launched a major attack to force the Allies out of Gallipoli. They suffered heavy casualties.
May 23rd: Italy declared war on Austria-Hungary.
May 24th: A ceasefire was ordered for Anzac Cove to allow for the dead to be buried. The Austrian Navy bombarded Italian coastal towns and sunk the Italian destroyer ‘Turbine’.
May 25th: ‘HMS Triumph’ sunk by U-21 off the Dardanelles. Second Battle of Ypres ended.
May 26th: Italy announced that they would blockade Austria.
May 27th: ‘HMS Majestic’ sunk by U-21 off the Dardanelles.
May 30th: The Italians bombed the Austrians fleet base at Pula.
May 31st: The first Zeppelin raid on London took place killing 28 and wounding 60.
June 18th: The French Spring Offensive in Artois was ended.
June 20th: The Germans launched an offensive in the Meuse-Argonne area.
June 23rd: First Battle of Isonzo.
July 1st: Central War Industries Committee introduced to Germany and Austria-Hungary to co-ordinate war production.
July 7th: First Battle of Isonzo ended with minor Italian victories.
July 12th: German coal industry placed under state control.
July 13th: The German offensive in Meuse-Argonne came to an end.
July 18th: Second Battle of Isonzo started.
August 1st: The start of the ‘Fokker Scourge’ with the Fokker monoplane dominant over the Western Front.
August 3rd: Second Battle of Isonzo ended with a total of 90,000 casualties but with minimal territorial gains for the Italians.
August 5th: Germany captured Warsaw from the Russians
August 6th: Attempted breakout from Anzac Cove to capture nearby heights.
August 10th: The Turks recapture lost land and forced the Allies back to Anzac Cove.
August 20th: Italy started a sustained bombing campaign against Austrian military targets.
August 21st: The 29th Division was ordered to attack Hill 60 and Scimitar Hill. The attack failed with heavy casualties.
September 1st: Germany pledged that neutral ships would not be targeted in the sea war.
September 25th: The British Army used poison gas for the first time at the Battle of Loos.
September 26th: Start of Battle of Kut al-Amara.
September 28th: End of Battle of Kut al-Amara; British forces defeated the Turks.
October 11th: Bulgarian troops attacked Serbia.
October 14th: The Battle of Loos came to an end.
October 18th: Third Battle of Isonzo started.
November 4th: Third Battle of Isonzo ended with no obvious gains for either side.
November 10th: Lord Kitchener visited the Gallipoli front and decided to withdraw ANZAC forces there. Fourth Battle of Isonzo started.
November 25th: The Serbian Army was ordered to retreat through Albania with the German Army in pursuit.
November 27th: Very poor weather led to 15,000 troops being evacuated from Anzac Cove for frostbite, trench foot and exposure.
December 3rd: Fourth Battle of Isonzo ended with minimal territorial gains for Italy.
"1915 and World War One". HistoryLearningSite.co.uk. 2009. Web.