At the Battle of First Manassas, also known as First Bull Run, CPT William W. Goldsborough and the 1st Maryland meet PVT Bicknell and the 5th Maine on the battlefield at Chinn Ridge late in the afternoon of 21 July 1861.
Sources used for this episode:
Goldsborough, William W. The Maryland Line in the Confederate States Army. Baltimore: Kelly, Piet & Company, 1869. https://www.gutenberg.org/cache/epub/58632/pg58632-images.html.
Bicknell, George W. History of the Fifth Regiment Maine Volunteers, Comprising Brief Descriptions of its Marches, Engagements, and General Services from the Date of its Muster In, June 24, 1861, to the Time of its Muster Out, July 27, 1864. Portland: Hall L. Davis, 1871. https://babel.hathitrust.org/cgi/pt?id=hvd.32044050533173&seq=7.
Scott, Robert N. The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies. Ser. 1, Vol. 2. Washington: Government printing Office, 1880. https://babel.hathitrust.org/cgi/pt?id=coo.31924077730186&view=1up&seq=3.