A Serbian nationalist student, Gavrilo Princip assassinated the Austrian Archduke Ferdinand and his wife.
Austria declared war on Serbia.
Britain dec lared war on Germany.
A series of battles fought al9ong the eastern frontiers of France after the outbreak of World War I.
A parites of German and British soldiers exchange greetings.
A joint British and French operation was mounted to capture the Ottoman capital of COnstantinople and secure a sea route to Russia.
German used zeppelins to attack London.
The German mounted an attack on the French at Verdun designed to 'bleed the French dry'.
The Battle of the Somme was one of the largest battles of the war. 58,000 British troops killed (one third of them killed) on the first day of the battle.
Germany was out of sources.
The treaty is signed by 33 countries.