[6] In 1906, rebels in Havana were defeated by a force of the Cuban Rural Guard and other volunteers commanded by General Alfredo Rego and Collazo in the Tapaste Hills.

In August 1917, he toured the United States to learn the workings of the U.S. Army's selective draft by President Mario García Menocal's order.

[15] On August 19, 1922, Collazo, an expert swordsman,[16] and Colonel Orestes Ferrara, a representative for Havana province settled a point of honor with a duel.

[17] The duel was initiated due to news stories published in Ferrara's Havana paper, El Heraldo de Cuba, about Collazo's two nephews being killed in a street brawl in Marianao.

[21] In October 1930, Collazo departed from Cuba to New York before being implicated in an alleged plot to assassinate fellow senate members that was uncovered by Havana newspaper El Pais Today.

He was also accused of fomenting revolution and investigated for organizing a plot to seize arms and munitions at the Fortress La Cabaña for a revolutionary movement.

[24] Collazo and the others being held were questioned by Federal authorities to determine whether they had broken any laws against revolutionary activity in a friendly country, despite their claim that they were out fishing.

After retreating to Atarés Castle as a rebel stronghold, Rosendo Collazo along with Blas Hernandez and Circo Leonard were later forced to surrender on November 9.