The situation in Mexico deteriorated throughout 1910, and there were a number of incidents in which Mexican rebels crossed the U.S. border to obtain horses and weapons. After Díaz jailed opposition candidate Madero prior to the 1910 presidential election, Madero's supporters responded by taking up arms against the government. This unrest resulted in both the ousting of Díaz and a revolution that would continue for another ten years. In the Arizona Territory, two citizens were killed and almost a dozen injured, some as a result of gunfire across the border. Taft would not be goaded into fighting and so instructed the territorial governor not to respond to provocations. In March 1911, he sent 20,000 American troops up to the Mexican border to protect American citizens and financial investments in Mexico. He told his military aide, Archibald Butt, that "I am going to sit on the lid and it will take a great deal to pry me off".