why did Britain and France fought world war I and II together while they were very big enemies
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Why did war break out in 1914?Back to top 
The Great War of 1914-18 began in August 1914. The causes of this war have been debated by politicians and historians ever since. One of the few things that historians have been able to agree about is that the war was the result of many different complex factors working together. These factors meant that the situation in Europe in 1914 was very tense. This in turn allowed one crisis to spiral out of control and spark off a war that killed millions.
The war was fought between rival alliances of European powers:
In 1879, Germany and Austria-Hungary formed an alliance (the Dual Alliance) that gave them great strength in the centre of Europe.
In 1892, the French and the Russians formed their own strong alliance (the Dual Entente) that meant Germany now had an unfriendly power on each side.
Soon afterwards, Germany's most powerful soldier, General Schlieffen, drew up a plan that would allow Germany to beat France very quickly in any future war. This would then free most German troops to fight Russia in the east.
By the early 1900s, the alliances had developed. The Dual Alliance had become the Triple Alliance with Italy (although Italy stayed out of the war in 1914).
In 1907, Britain joined Russia and France to form the Triple Entente. Britain was much less committed to this alliance than Russia or France.