July 4-5, 1963 follow-up to Battle of Gettysburg
Battle of Monterey Pass
During a torrential rainstorm on the night of July 4-5, 1863, the Michigan Cavalry Brigade moved to intercept the retreating Army of Northern Virginia by attacking the miles-long wagon train of the Second Corps and its cavalry escort at this location. The opposing troops collided in hand-to-hand combat in the narrow pass. The 5th Michigan Calvary, led by Colonel Russell A. Alger, future Secretary of War and Michigan Governor, charged up the eastern slope and across Red Run Creek Bridge. Although nothing was discernible a half dozen paces ahead, Union forces triumphed. By 3:00 A.M. they had taken many supplies and captured thirteen hundred Confederate prisoners.
Source : MichMarkers (Civil War)