"Blockade of Engines at Martinsburg, West Virginia," an engraving on front cover of "Harper's Weekly, Journal of Civilization," Vol XXL, No. 1076, New York, Saturday, August 11, 1877.
<p>Fighting occurred during <a href="https://en.wikipedia.org/wiki/en:Great_railroad_strike_of_1877" class="extiw" title="w:en:Great railroad strike of 1877">Great railroad strike of 1877</a>.
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Scanned from an original issue.  Some cropping of original image.
Harper's Weekly