Military Units at the Arsenal on July 7, 1865

[L Verge]

I always thought Powell struggled more also. Aren't there references to him jerking his legs upwards trying to relieve the pressure on his neck?

I wonder where Keller's unit was stationed since he talks about having marched about ten miles that day. That would put him in a radius of five miles from the Arsenal, but five miles could cover a good distance in D.C. of 1865.