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A young Serbian nationalist named Gavrilo Princip killed Ferdinand and started a conflict between Austria-Hungary and Serbia. His assassination was the primary cause.
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Austria-Hungary declared war on Serbia due to the assassination of Ferdinand. World War I begins.
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"May have been the war to end all wars" (History.com) but, it was also the start of new technologies civilian and military wise.
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French and British forces confronted the invading Germany army, which had by then penetrated deep into northeastern France, within 30 miles of Paris.
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Due to the chemical weapons killing thousands of people, the people in the war had to find a way to breathe without dying.
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The first steel helmet used in World War I was the “Brodie” helmet, it was first introduced to British soldiers during WW1.
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the longest battle in modern history
