Current estimates are that two thirds of the military casualties of WW1 were those killed in the front lines. read more
If you are speaking about “direct” trench warfare, that is those who were attacked/defended inside the trenches, the answer is relatively few. There were certainly deaths in the trenches from artillery caving in the walls and burying those who were close. read more
The precise number of people killed during the First World War is difficult to measure. Estimates vary from 8.5 to 12.0 million but with the collapse of government bureaucracies in Russia, Germany, Austria-Hungary and Turkey accurate measurement becomes impossible. Another problem involves the way death was defined. read more