South Mountain, a ridge composed largely of resistant quartzite, posed a formidable obstacle to the early settlers until 1755 when General Edward Braddock and a young surveyor, George Washington, constructed a road over one of its passes. Greenbrier, Washington Monument and Gathland are neighboring state parks along South Mountain.
The Battle of South Mountain (which was actually two separate battles), broke out on September 14 in the Fox's Gap and Turner's Gap areas after Confederate gunners opened fire on Federal forces moving toward the base of the mountain. Confederate General Samuel Garland and Federal General Jesse Reno both received mortal wounds during the heavy fighting near Fox's Gap. Here too, future presidents Rutherford B. Hayes and William McKinley participated in the battle.