https://www.history.com/news/the-assassination-of-archduke-franz-ferdinand

Declaration of War with Great Britain, 1812

Jun 17, 1812

https://www.senate.gov/pagelayout/history/h_multi_sections_and_teasers/WarDeclarationsbyCongress.htm

Second Battle of Bull Run

Period: Aug 28, 1862 to Aug 30, 1862

https://www.britannica.com/event/Second-Battle-of-Bull-Run-1862

Battle Of Chancellorsville

Period: Apr 30, 1863 to May 6, 1863

https://www.historynet.com/battle-of-chancellorsville

Battle of Gettysburg

Period: Jul 1, 1863 to Jul 3, 1863

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

Battle of the Wilderness

Period: May 5, 1864 to May 7, 1864

https://stonesentinels.com/the-wilderness/battle-wilderness-facts/

Battle at Cold Harbor

Period: May 31, 1864 to Jun 12, 1864

https://study.com/academy/lesson/battle-at-cold-harbor-summary-facts-quiz.html

The Russian Mobilization in 1914

Jul 30, 1914

https://www.jstor.org/stable/259967?seq=1

April 22, 1915: A Fearful Word in the Trenches: 'Gas!'

Apr 22, 1915

https://www.wired.com/2008/04/dayintech-0422/

The Sinking of the Lusitania on May 7, 1915

May 7, 1915

https://medium.com/america-and-the-great-war/the-sinking-of-the-lusitania-on-may-7-1915-f9c7eb9576a

Woodrow Wilson Asks For Declaration of War Against Germany

Apr 2, 1917

https://learning.blogs.nytimes.com/2012/04/02/april-2-1917-woodrow-wilson-asks-for-declaration-of-war-against-germany/

Declaration of War Against Germany

Aug 14, 1917

https://www.loc.gov/law/help/digitized-books/world-war-i-declarations/foreign.php

Treaty of Versailles

Period: Jun 28, 1919 to Nov 11, 1918

https://www.britannica.com/event/Treaty-of-Versailles-1919

5 things you need to know about Armistice Day

Nov 11, 2020

https://www.historyextra.com/period/first-world-war/ww1-armistice-day-remembrance-sunday-poppies-silence-commemoration/