At the beginning of 1817 he laid siege to the city of Angostura.
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The following day Manuel Piar, General-in-Chief, was executed against the wall of the cathedral of Angostura by a firing squad.
Its bark is commonly misconstrued as being used in Angostura brand bitters which is named after the town in Venezuela.
In 1843, at the suggestion of his brother, Fredricks sailed for Angostura, today Ciudad Bolívar, Venezuela.
Born in Santa Rosa de Osos, Antioquia, to parents Antonio María Osorio and Pastora Benítez, he was raised by his grandparents in Angostura.