The rebel forces led by Pancho Villa and Pascual Orozco attacked federal forces at Cuidad Juarez in an attempt to end the dictatorship of Porfirio Diaz. This battle was considered one of the first major battles of the Mexican Revolution. The rebel group was armed with 2,500 untrained men while the federal forces only had 700 men.  Despite being untrained, the rebel forces led by Villa and Orozco greatly outnumbered the federal troops and defeated them at Cuidad Juarez. This success led to the forced resignation and end of Diaz's rule. This then brought on the introduction of Francisco Madero into power. 

Dasandi, Niheer. “Battle of Ciudad Juárez.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., www.britannica.com/event/Battle-of-Ciudad-Juarez.