The diagram below shows military innovations that affected the way World War I was fought: Image of a concept web with a central oval and four surrounding ovals. The central oval reads military innovations used in World War I. The surrounding ovals reads poison gas, trench warfare, submarines, and tanks and automatic weapons. © 2012 FLVS What effect did these innovations have on the war? (3 points) They made the war last longer than previous wars. They made secret operations extremely important. They led to rapid changes in the size of armies. They resulted in higher casualty rates than in the past.

The WWI left between 9 and 10 million dead and 20 million hurt soldiers. Additionally, it is estimated that civilian victims rise to 7 million. It was the first time in history that a war left such a massive number of victims and it was due to the use of new military technology. At first, the war was a clash between 19th-century technology against 20th-century technology, but in 1917 all the great armies, that added millions of men in their ranks, were modernized. The war became a competition for the creation of the most lethal weapons. To the German invention of submarines, advanced artillery, and poison gas, which killed thousands of soldiers and civilians as well, the British created the first aircraft carrier and the first tanks. For these reasons, the WWI was the most lethal war in History before the WWII.