Only Francisco Solano López held the rank of general, which was why Robles was responsible for organizing and commanding the troops of his nation gathered at Fort Cerro León.

[1][2] On April 14, 1865, he left Itapirú at the head of an expeditionary force of 3,000 men, occupied the city of Corrientes, and advanced towards the south of that province.

[1] López sent Lieutenant Colonel Paulino Alén to award the National Order of Merit to him, but Robles violently rejected the decoration, protesting loudly about the hardships suffered by his troops, especially their lack of coats.

[1] In response, López promoted Colonel Francisco Isidoro Resquín to the rank of brigadier general and named him second commander of the Southern Division.

[1][3] Robles was transferred to Humaitá and after being judged for failure to comply with orders, he was shot at the Paso de Patria Camp on January 6, 1866.