https://www.wearethemighty.com/mighty-history/reason-working-girls-called-hookers/Joseph Hooker was a Union Army officer that served as major general during the Civil War.
Was in charge of the Army of the Potomac and suffered a major defeat in the Battle of Chancellorsville. He liked to party and was often seen with “working girls” and that is why hookers are called hookers.
Another Union major general was Gen Burnside and his striking way of arranging his facial hair gave rise to the term “sideburns.” He did OK defending Knoxville but was generally useless and Grant had him discharged and the two remained friends even after that.
Grant had another military friend in W T Sherman.