Why did great britain enter ww1?

Britain entered World War I in 1914 to honor a treaty that promised to defend Belgium and to fulfill an alliance with France and Russia. The Germans attacked Liege, Belgium, in the first battle of World War I, and then marched on to attack France. read more

Even when German troops invaded France and Belgium as part of the Schlieffen Plan, Britain did not have to go to war. Germany hoped Britain would stay out of the war altogether. However, the Germans knew that Britain had promised to defend Belgium under the Treaty of London of 1839. read more