When General Howard became head of the Freedman's Bureau, Logan became the commander of the Army of the Tennessee for the final march to Washington.

He soon sent out the following circular to his men: 'The following is announced as the badge of this corps: A miniature cartridge box, black, set transversely on a field of cloth or metal: above the cartridge box plate will be stamped or marked in a curve, the motto "Forty Rounds".

'An alternate retelling of the tale behind the unique corps-badge, as given by Sherman in his Memoirs: 'It was on this occasion that the Fifteenth Corps gained its peculiar badge: as the men were trudging along the deeply-cut, muddy road, of a cold, drizzly day, one of our Western soldiers left his ranks and joined a party of the Twelfth Corps at their camp-fire.

At that time Blair commanded the corps; but Logan succeeded soon after, and, hearing the story, adopted the cartridge-box and forty rounds as the corps-badge.

'[1]The Fifteenth Corps is highlighted near the end of Chapter III of MacKinlay Kantor's Pulitzer Prize-winning novel "Andersonville" (1955).