During both World War efforts, Detroit’s factories and their manufacturing might was flipped from automobile production to support for the war effort. During World War II, at least 110 factories in Detroit retooled to produce parts for aircraft, tanks, and weapons.
Recently, the news media (Crains, Free Press, Detroit News) have reached back into history in an attempt to compare the Coronavirus global pandemic to a war effort. There are serious issues with comparing a public health response to a war, but today is all about the geography.