Also called The Great War, World War I was one of the deadliest conflicts in history, and set the stage for another world war just 20 years later.

CBBC. Multi-award-winning comedy sketch show Horrible Histories is back for a one-off World War One special, stuffed with the usual mix of fascinating facts, popular pastiches and gruesome gags.

August 1, 1914 – Germany declares war on Russia. August 2, 1914 – Ottoman Empire and Germany sign a secret treaty of alliance . August 4, 1914 – Germany invades Belgium.

KS2 History World War One learning resources for adults, children, parents and teachers.

See our dedicated World War 1 section here. Read more. Society: What Ireland was really like in 1914. There can never be shame in remembering Ireland's fallen .

Causes of World War One. In 1914, Europe's most powerful countries went to war with each other. World War One lasted for four years, from 1914-1918, and resulted in the deaths of millions.