What spy helped Beauregard at bull run?

The spy who notably assisted General P.G.T. Beauregard during the First Battle of Bull Run was Rose O'Neal Greenhow. She was a Confederate sympathizer and used her connections in Washington, D.C., to gather intelligence on Union troop movements. Her information helped Beauregard prepare for the battle, contributing to the Confederate victory. Greenhow's espionage efforts made her a significant figure in the Civil War's early intelligence operations.