Herrera was in the biggest fight of the war to that date, the second battle of Torreón in 1914. With 400 other women, she took the city on May 30, 1914. Cosme Mendoza Chavira, another follower of Villa, said ""Ella fue quien tomo Torreón y apago las luces cuando entraron en la ciudad"" (She was the one who took Torreón and turned out the lights when they entered the city.") Conventional history does not say anything about the participation of Petra Herrera. Villa gave the role of Petra Herrera in the revolution to an unknown woman.