It’s a myth that the camp followers of Union General Joseph Hooker gave us the popular euphemism for a prostitute.
It’s true they were called “Hooker’s division,” or “Hooker’s reserves,” but the word predates the American Civil War as, of course, does the profession.
It first appeared in 1845 as a reference to an area of New York known as “the Hook,” where ladies of the night could be found in abundance.