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In page Martinsburg, West Virginia:

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According to William Still, "The Father of the Underground Railroad" and its historian: Mr Robert Brown, alias Thomas Jones, escaped from slavery in Martinsburg on Christmas night in 1856. He rode a horse and had it swim across the freezing Potomac River. After riding forty miles, he walked in cold wet clothes for two days, to Harrisburg, Pennsylvania. He received assistance there from the Underground Railroad and traveled by train to Philadelphia, and the office of William Still with the Pennsylvania Anti-Slavery Society. Brown's wife and four children had been sold; he sought help to find them. He had a likeness of his wife, and locks of hair from each of them.[citation needed]