What Was The Role of David Herold

[DanielC]

If Herold was given the task of assasinating Johnson why would he show up at the Kirkwood unarmed? Would Booth and Herold really wait for Atzerodt at the bridge? Here is someone who basically intimated to them he wanted no part of killing. Why a third wheel on the way south. Yes he had knowledge of that area, and the waterways, but was it anymore then Herold?