(L-R)German President Joachim Gauck, King Philippe of Belgium and Queen Mathilde of Belgium stand during a ceremony marking 100 years since the invasion of Belgium by Germany at the start of World War I, on August 4, 2014 in Leuven. World leaders on August 4 commemorated the 100th anniversary of the outbreak of World War I, a small Balkans conflict that went global with the German invasion of neutral Belgium in August 1914. AFP PHOTO / BELGA/NICOLAS MAETERLINCK -BELGIUM OUT-        (Photo credit should read NICOLAS MAETERLINCK/AFP/Getty Images)