During the Mexican Revolution, the first Zapatistas came into the borough through Milpa Alta. They burned areas in Nativitas and San Lucas in 1911 and then stayed without further attacks. They then took the city of Xochimilco in 1912, burning the southern part. The Zapatistas then controlled most of what is now the borough. On 23 April 1913, 39 youths were shot to death in a small alley in San Lucas Xochimanca. A plaque commemorates the site. When the Zapatistas were confronted by troops loyal to Venustiano Carranza in Cuemanco, they damaged pumps and set the center of Xochimilco and the original municipal palace on fire. In 1914, Francisco Villa and Emiliano Zapata met in San Gregorio and signed an alliance called the Pact of Xochimilco.