n Front. They built networks of trenches that ran 500 miles. The First Battle of the Marne was the war's first major turning point. German army has almost reached its objective Paris in accordance with the Schlieffen Plan, but the Battle of the Marne stopped the movement of Germans in the west. Unfortunately for the Germans, the plan did not work as expected. The result was a partial success, which failed in its ultimate goal of knocking the French army out of the war early. The Battle of the Marne marked the end of the Schlieffen Plan, the end of movement in the war and the start of Trench Warfare. Eventually the trenches were stretching 25,000 miles, from Switzerland to the North Sea. On the other hand, Germans were much successful on the Eastern Front and had a series of quick victories over Russia. Only in a single Battle of Tannenberg 92,000 Russian prisoners were taken. After the failure of the German offensive, both sides made various local attempts at achieving breakthroughs. Most of these attempts failed due to the effects of modern weapons.The First World War was the first war to use poison gas as a military weapon. Germans also had the first submarines and used them to blockade Britain by sinking British ships. The sinking of Lusitania is the famous example of the submarine warfare during the World War I. The Lusitania had civilians on board, where 100 passengers were American citizens. After sinking Lusitania a letter was sent to the German Government by President Wilson to warn the German government against killing Americans citizens.In October 1915 Ottoman Turkish Empire enters war on German side. Turkish army began invasion of Russia and was very successful until Great Britain attacked Turkey. British, French, Australian and New Zealand were unsuccessful in invading Turkey. The action was confined to the Dardanelles Strait and the tip of the Gallipoli Peninsula near Istanbul. The same year, Italy had withdrawn from the Tr...
