Signal Hill Monument

At 8:45 A.M. on July 21st 1861, during the Battle of First Manassas (Bull Run), Capt. E.P. Alexander, CSA, sent America’s first battlefield telecommunication from this hilltop: “Look out for your left, you are turned.” His short warning to Col. Evans about Brig. Gen. McDowell’s flank march helped change an impending defeat into a crucial victory and secured for the signal corps a permanent place in the ranks of modern armies. It also honors America’s Confederate signal veterans, the first to raise in battle “the bonnie white flag that bears the crimson square.”

Manassas Park, Virginia · United States