Bombing Civilians examines a crucial question: why did military planning in the early twentieth century shift its focus from bombing military targets to bombing civilians? From the British bombing of Iraq in the early 1920s to the most recent policies in Kosovo, Afghanistan, Iraq, and Lebanon, Bombing Civilians analyzes in detail the history of indiscriminate bombing, examining the fundamental questions of how this theory justifying mass killing originated and why it was employed as a compelling military strategy for decades, both before and since the bombing of Hiroshima and Nagasaki.