Across
- 3. Country that Germany declared war on, 1 August 1914
- 4. Country that mobilized to support Serbia
- 7. Country allied with Russia and Britain, mobilized on 1 August 1914
- 10. Country that gave Austria-Hungary a "blank cheque" of support
- 11. Empire that joined the Central Powers in October 1914
- 12. Country that declared war on Germany in August 1914
Down
- 1. Country that declared war on Germany on 4 August 1914
- 2. Country that Austria-Hungary declared war on, 28 July 1914
- 5. Country that joined the Allies in May 1915
- 6. Country invaded by Germany on 3 August 1914
- 8. Archduke assassinated on 28 June 1914
- 9. Country that declared war on Germany in April 1917
