The triumph of the revolutionary movement in timber, resumed his studies at the Engineering School and he was taught classes in artillery by General Felipe Angeles.
In 1923, Amaro's chief of staff José Álvarez learned of the plot between generals Enrique Estrada, Guadalupe Sánchez, and Fortunato Maycotte to overthrow President Álvaro Obregón.
The conspirators drafted Adolfo de la Huerta, then-Minister of Finance, to run for president against Plutarco Elías Calles, Obregón's chosen successor.
Facing a rebellion with armies in the North, South, and East, Obregón relied on loyal generals such as Amaro to block rebel access to resources and the northern border and to put down the insurrection.
He was arrested in 1926 by the FBI under the leadership of by Special Agent Edwin Atherton while heading a large convoy of armored vehicles and armed men east of San Diego, California, and jailed in the United States for 21 months.