He survived the war after a year of dysentery and malaria, curing himself chewing leaves of cocaine introduced by the Bolivian prisoners.
In Posadas he acquired a ship that he used to carry packages up the river to the now inexistent Salto del Guairá, and traveled back in boats to Rosario.
He returned to Asunción in 1950, during the dictatorship, and was arrested countless times for freely exposing his ideas in every journal that wanted to publish them.
In his "History of the Paraguayan Literature", Hugo Rodríguez-Alcalá writes about the dramatic work of this author: "Rivarola Matto knows how to create the characters and the ambient, and combines skillfully the serious and the hilarious.
In narrative is author of a novel, "Follaje en los ojos", from 1952, in which he shows the anguished life in the herbal manufactures of the Alto Paraná Department.
In his theatrical work exist a fundamental precedent in the Paraguayan contemporary theater: Encrucijada del Espíritu Santo (The Crossroads of the Holy Spirit), edited in 1972.
The main character is José, a young priest that appears old at the end of the story, expressing the continuous turns of the argument.
The author stated that it was a great synthesis deployed in the 17th and 18th Century in the Jesuit missions, although he did not gave more details about the time lapse.