The 42nd Division, or "Rainbow Division" as it was known popularly, was composed entirely of unproven National Guard units hailing from twenty-six different states and the District of Columbia. For that reason, there were many who thought the division would never see combat when it deployed to France in October 1917. However, the division would spend 164 days in combat during World War I, a number exceeded by only two other American divisions. Despite...
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