in surgery knows of trephining. The process in operation

before Buell could arrive on the ground. It became necessary

therefore to put Louisville in a state of defense, and after the

cordon of principal works had been indicated, my troops threw up in

one night a heavy line of rifle-pits south of the city, from the

Bardstown pike to the river. The apprehended attack by Bragg never

came, however, for in the race that was then going on between him and

Buell on parallel roads, the Army of the Ohio outmarched the

Confederates, its advance arriving at Louisville September 25.