He primarily attacked Spanish holdings in Maracaibo, Gibraltar, Trujillo, La Guaira, Puerto Cabello, Cumana and Veracruz.

De Grammont landed his men in Spanish-held Venezuela and captured Maracaibo, as well as several smaller towns including Gibraltar, penetrating as far inland as Trujillo.

At dawn on the next day, Grammont was a few leagues from the town, as he led his 600 men, they were spotted in the early morning mist by Prebyster Francisco Garcerán, who was at that time on the road, immediately he turned around and at full gallop returned to town, he went to the main church and rung the bells to alert everyone of the approaching danger, the inhabitants took all their valuables away, so Grammont and his men were not able to get much plunder, and to make matters worse, on the way back to the ships on the coast, his forces were ambushed and they had to fight their way out, suffering heavy casualties, but managed to get away with the rest of his men and sailed away.

On the following day, however, he received word that 2000 men were approaching from Caracas, and as the enemy were also rallying in force in the vicinity of the town he was compelled to retire to the ships.

This movement was executed with difficulty, and for two hours de Grammont with a handful of his bravest companions covered the embarkation from the assaults of the Spaniards.

The buccaneers caught the garrison off guard, many of the soldiers still sleeping, and took out the city's defenses allowing the rest of the fleet to enter the harbor.

[2] De Grammont was last seen in April 1686 heading northeast to sail off of St. Augustine, Florida, planning a raid alongside French buccaneer Nicolas Brigaut.