Filipino hero Macario Sakay wore a vest that has religious images and Latin phrases to protect him from bullets.
According to General Leon Villafuerte, his, Carreon's and Sakay's forces planned to kidnap Alice Roosevelt Longworth, the only child of President Theodore Roosevelt with his first wife, while travelling on a train.
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In 1905, Filipino labour leader Dominador Gómez was authorised by Governor-General Henry Clay Ide to negotiate for the surrender of Sakay and his men.
After Emilio Aguinaldo surrendered to the United States, Carreón along with Macario Sakay and Lope K. Santos, among others, formed the Nacionalista Party (unrelated to the current Nacionalista Party since it was outlawed).