Similar to 第一次世界大戦下の宣戦布告

Christmas truce

Nye Committee

1917 French Army mutinies

Declaration of war

Declaration of war by the United States

United States declaration of war on Italy

United States declaration of war on Austria-Hungary

United States declaration of war on Spain

United States declaration of war on Germany (1917)

United States declaration of war on Germany (1941)

United States declaration of war on Japan

Declarations of war by Great Britain and the United Kingdom

United Kingdom declaration of war upon Germany (1914)

United Kingdom declaration of war on Japan

Italian declaration of war on the United States

Convention Relative to the Opening of Hostilities

Declaration of war by Canada

Imperial decree of declaration of war against foreign powers

Declarations of war during World War II

On conducting a special military operation

Japanese declaration of war on the United States and the British Empire

World War I

World War One (disambiguation)

Fiction based on World War I