What are 5 events that happened in ww1

1. Archduke Franz Ferdinand is assassinated in Sarajevo.
2. Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities.
3. Germany invades Belgium, beginning World War I.
4. A German submarine sinks the passenger liner Lusitania. The ship carries 1,198 people, 128 of them Americans.
5. The British employ the first tanks ever used in battle, at Delville Wood. Although they are useful at breaking through barbed wire and clearing a path for the infantry, tanks are still primitive and they fail to be the decisive weapon, as their designers thought they would be.

These were to deal with the countries who lost the war (against the Allied Nations) These treaties were 1: Treaty of Versailles ( dealt with Germany) 2: Treaty of St. Germain (dealt with Austria) 3: Treaty of Trianon (dealt with Hungary) 4: Treaty of Neuilly (dealt with Bulgaria) 5:Treaty of sevres (dealt with Turkey) The main reason for these treaties was to demilitarise the arimes which prevented them from becoming threats to the Allied nations any time soon.