A widower with small children and successful farmer, he did not join the Revolution until after the February 1913 coup d'état against Francisco I. Madero that brought General Victoriano Huerta to the presidency. Obregón supported Sonora's decision to follow Governor of Coahuila Venustiano Carranza as leader of the northern revolutionary coalition, the Constitutionalist Army, against the Huerta regime. An untrained soldier but natural leader, Obregón rose quickly in the ranks and became the Constitutionalist Army's best general, along with Pancho Villa. Carranza appointed Obregón commander of the revolutionary forces in northwestern Mexico. When the Constitutionalists defeated Huerta in July 1914, and the Federal Army dissolved in August, Villa broke with Carranza, with Obregón remaining loyal to him despite Carranza's conservatism. In the civil war of the winners (1914–15), between Carranza and Obregón on one side and Villa and peasant leader Emiliano Zapata on the other, Obregón decisively defeated Villa's army in 1915. Carranza became the undisputed leader of Mexico. In 1915 Carranza appointed him as his minister of war. Obregón became increasingly disillusioned with the conservative Carranza, whom Obregón believed should have become interim president of Mexico and thus been excluded from election as the constitutional president. Carranza was elected president in 1917, after the promulgation of the new revolutionary Constitution of Mexico. Obregón returned to his ranch in Sonora, planning on running for the presidency in the 1920 elections. Since Carranza could not be re-elected and he wished to remain a political force, he designated Ignacio Bonillas, a civilian, to succeed him. In response, in 1920, Obregón and fellow Sonoran revolutionary generals Plutarco Elías Calles and Adolfo de la Huerta launched a revolt against Carranza under the Plan of Agua Prieta. De la Huerta became interim president until elections were held. Obregón won the presidency with overwhelming popular support.