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{Battle of Tannenberg}(https://www.worldatlas.com/articles/major-battles-of-world-war-i-ww1.html)
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{ Austrian-Hungary declared war on Serbia.}(https://www.loc.gov/law/help/digitized-books/world-war-i-declarations/foreign.php)
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{Battle of Gallipoli}(https://www.worldatlas.com/articles/major-battles-of-world-war-i-ww1.html)
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{ Lusitania Sinks}(https://www.shmoop.com/wwi/timeline.html)
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{Battle of Juntland}(https://www.worldatlas.com/articles/major-battles-of-world-war-i-ww1.html
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{Battle of the Somme}(https://www.worldatlas.com/articles/major-battles-of-world-war-i-ww1.html)
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[Assassination of Archduke Ferdinand}(https://www.history.com/news/the-assassination-of-archduke-franz-ferdinand-100-years-ago)
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{First Tanks}(https://www.shmoop.com/wwi/timeline.html)
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{Battle of Passachendaele}( https://www.worldatlas.com/articles/major-battles-of-world-war-i-ww1.html)
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{Zimmerman Telegram}(https://www.archives.gov/education/lessons/zimmermann)
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{China declared war on Austria-Hungary}(https://wwi.lib.byu.edu/index.php/Declarations_of_War.)
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