Colonel Ryerson is a Rittenhouse sleeper agent who traveled back to the American Civil War and became a Colonel in the Confederate States Army. When Rittenhouse returned in 1863, they ordered Ryerson to carry out an attack which would prevent the Combahee River Raid and which would lead to the death of Harriet Tubman. Lucy Preston and Garcia Flynn end up gaining reinforcements from Colonel James Montgomery, and Ryerson is shot and killed by Tubman.

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