George V and Kaiser Wilhelm II together in 1913 in Germany

As Europe teetered on the edge of war, the British king attempted to avert conflict by appealing to his cousins, Kaiser Wilhelm and Ensar Nicholas. Despite his efforts, war was inevitable. In 1914, King George of England signed the declaration of war against Germany, marking the beginning of World War I.

What significant action did George of England take in 1914?

What was the declaration that George of England signed?