The _______ was a naval battle in which the British and Dutch were able to maintain a blockade of German ships. The last major battle of World War I was _______. World War I ended with the _______, which was like a truce. The name of the organization of nations whose purpose was to solve conflicts peacefully through negotiations was known as _______. _______ were first used in World War I because they were needed to cross the muddy and uneven terrain in Europe. Germans used _______ to try to match the might of the powerful British navy. The medical advance that saved soldiers' lives by helping to reset broken bones was the _______.