In World War I, tanks first appeared at the Battle of Flers-Courcelette in September 1916. It was the first time tanks had been used in a military conflict. The British tanks were quite slow; seldom able to meet their top speed of five miles per hour. However, the British Army's officer corps was dominated by people from existing cavalry regiments who despised the new devices and stubbornly clung to their horses despite the fact that horses and deep mud versus German machine guns was a losing proposition.
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