In May 1911 , federal troops loyal to Porfirio Díaz that had controlled the city left and revolutionary troops supportive of Francisco I. Madero marched in . The Maderistas claimed the Chinese had " sniped " at them , and Mexican townspeople attacked individual Chinese and looted Chinese businesses . The brother of Francisco Madero , Emilio Madero , was a military commander and brought order to Torreón soon after he arrived , but by then over 300 Chinese had been killed in the Torreón massacre . Francisco Madero became president in November 1911
Torreón massacre
Torreón massacre
Chinese immigration to Mexico