Look up Casualty in Wiktionary, the free dictionary.
Casualty has several meanings: Wikipedia does not have an article with this exact name. ... Wiktionary is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...
Casualty (person), which refers to a person wounded or killed in a war or disaster
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B.H. Liddell Hart was a Captain in the British army during the war.
Liddell Hart's conclusion, basically, was that the heavy casualties suffered in World War I were due primarily to the incompetence of the officers in charge.
Most of the lessons needed to conduct this war effectively were revealed in the American Civil War, which was the first major industrial war (machine guns, trains to move troops, ironclad ship, but more importantly, a war where the industrial base of a nation was recognized as a proper military target).