In the alley next to the Desplaines Street Police Station, which is no longer standing, 176 police officers gathered on the evening of May 4, 1886. The officers waited for orders from the infamous Captain Bonfield to break up the gathering in Haymarket Square. Mayor Carter Harrison, who had been at the Square and decided it was a peaceful assembly, came to this station and told Bonfield to send his police officers home. After Bonfield heard that the Mayor had finally left the Square, Bonfield ordered his officers to advance. Mayor Harrison heard the bomb blast from his home on Ashland Avenue, and rushed back to the Desplaines Station.