World War I

Assassination of Archduke Ferdinand

Jun 28, 1914

https://www.history.com/this-day-in-history/archduke-ferdinand-assassinated

Germany Declares War on Russia

Aug 1, 1914

https://www.historyplace.com/worldhistory/firstworldwar/index-1914.html

Germany Declares War on France

Aug 3, 1914

https://www.history.com/this-day-in-history/germany-and-france-declare-war-on-each-other

First Battle of Marne

Sep 6, 1914

https://www.history.com/topics/world-war-i/first-battle-of-marne

Germany Declares War on US

Dec 11, 1914

https://www.history.com/this-day-in-history/germany-declares-war-on-the-united-states

The Lusitania was sunk

May 7, 1915

https://www.history.com/news/how-the-sinking-of-lusitania-changed-wwi

The Soldiers declared their Unofficial Truce

Dec 7, 1915

https://www.smithsonianmag.com/history/the-story-of-the-wwi-christmas-truce-11972213/

Battle of Gallipoli

Feb 19, 1916

https://www.history.com/topics/world-war-i/battle-of-gallipoli-1

Battle of Verdun

Feb 21, 1916

https://www.britannica.com/event/Battle-of-Verdun

Battle of Jutland

May 31, 1916

https://www.britannica.com/event/Battle-of-Jutland

Battle of the Somme

Jul 1, 1916

https://www.history.com/topics/world-war-i/battle-of-the-somme

Entry about Armistice Day

Nov 11, 1918

https://www.theworldwar.org/armisticeday

Treaty of Versailles

Jun 28, 1919

https://www.history.com/topics/world-war-i/treaty-of-versailles-1