I'm not so sure they ran as realized it was suicidal to engage a veteran army. I forget who this author is, from one of the ( public access ) war memoirs.
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Someone more familiar with the 26th, mostly students enlisting for the invasion, knows where they were later. If it was Harrisburg they'd have been assigned to protect the city.
Just ran into the grave of a member of the 26th- death date July, 1863. He's in a big Catholic cemetery in a small town called Lykens here in northern Dauphin county. I keep meaning to look up his story. Gave me chills seeing it, must have either been a student at Pennsylvania College or a local kid rushing to answer the invasion.