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1914
28 June Archduke Franz Ferdinand assassinated in Sarajevo
5 July Kaiser William II promised German support for Austria against Serbia
28 July Austria declared war on Serbia
1 August Germany declared war on Russia
3 August Germany declared war on France and invaded Belgium. Germany had to implement the Schlieffen Plan.
4 August Britain declared war on Germany
23 August The BEF started its retreat from Mons. Germany invaded France.
26 August Russian army defeated at Tannenburg and Masurian Lakes.
6 September Battle of the Marne started
18 October First Battle of Ypres
29 October Turkey entered the war on Germany’s side. Trench warfare started to dominate the Western Front.
1915
19 January The first Zeppelin raid on Britain took place
19 February Britain bombarded Turkish forts in the Dardanelles
25 April Allied troops landed in Gallipoli
7 May The “Lusitania” was sunk by a German U-boat
23 May Italy declared war on Germany and Austria
5 August The Germans captured Warsaw from the Russians
25 September  . Start of the Battle of Loos
19 December The Allies started the evacuation of Gallipoli
1916
27 January Conscription introduced in Britain
21 February Start of the Battle of Verdun
29 April British forces surrendered to Turkish forces at Kut in Mesopotamia
31 May Battle of Jutland
4 June Start of the Brusilov Offensive
1 July Start of the Battle of the Somme
10 August End of the Brusilov Offensive
15 September First use en masse of tanks at the Somme
17 December Lloyd George becomes British Prime Minister
1917
1 February Germany’s unrestricted submarine warfare campaign started
6 April USA declared war on Germany
16 April France launched an unsuccessful offensive on the Western Front
31 July Start of the Third Battle at Ypres
24 October Battle of Caporetto – the Italian Army was heavily defeated
6 November Britain launched a major offensive on the Western Front
20 November British tanks won a victory at Cambrai
5 December Armistice between Germany and Russia signed
9 December Britain captured Jerusalem from the Turks
1918
3 March The Treaty of Brest-Litovsk was signed between Russia and Germany.
21 March Germany broke through on the Somme
29 March Marshall Foch was appointed Allied Commander on the Western Front
9 April Germany started an offensive in Flanders
15 July Second Battle of the Marne started. The start of the collapse of the German army
8 August The advance of the Allies was successful
19 September Turkish forces collapsed at Megiddo
4 October Germany asked the Allies for an armistice
29 October Germany’s navy mutinied
30 October Turkey made peace
3 November Austria made peace
9 November Kaiser William II abdicated
11 November Germany signed an armistice with the Allies – the official date of the end of World War One.
Post-war – 1919
4 January Peace conference met at Paris
21 June The surrendered German naval fleet at Scapa Flow was scuttled.
28 June The Treaty of Versailles was signed by the Germans.

Reference: https://www.historylearningsite.co.uk/world-war-one/timeline-of-world-war-one/