1. Archduke Franz Ferdinand of Austria-Hungary is assassinated in Sarajevo by Gavrilo Princip of the Black Hand gang
2. Austria-Hungary and Germany submit requests to Serbia and Russia to investigate
3. Germany commits support to Austria-Hungary for whatever action they deem necessary
4. Austria-Hungary presents harsh 10 Point Ultimatum to Serbia, which Serbia mostly accepts
5. Austria-Hungary declares war on Serbia
6. Russia begins mobilising its army in support of Serbia
7. Germany declares war on Russia
8. Britain declares war on Germany due to violation of Belgian neutrality