when did germany declare war on belgium
The plan began to go wrong on 30 July 1914, when Russia mobilised its army, but France did not. Germany was forced to invent a pretext to declare war on France (3 August 1914). Things got worse when Britain declared war on Germany on 4 August 1914 because, in a Treaty of 1839, Britain had promised to defend Belgium.he Schlieffen Plan. Germany had been preparing for war long before 1914. In fact, Germany had started drawing up a plan for war-the Schlieffen Plan-in 1897. It took nine years to finalise, but it was based on the theory that Germany would be at war with France and Russia at the same time.