By this time, General Félix Díaz had heard about Reyes's death and contacted U.S. Ambassador Henry Lane Wilson. General Felix Díaz had been more successful than General Reyes. As a result of the resistance at the Presidential Palace, Diaz had retreated to the city arsenal, the Ciudadela, a few blocks from the Presidential Palace. He took control of the armory without much opposition, and found himself in possession of a defensible fort, with the government's reserve of arms and ammunition. From the ciudadela rebels began bombarding downtown Mexico City with their cannons, aiming for the National Palace.Krauze, Enrique. Madero Vivo. Mexico City: Clio, p. 119
