The loss of "Oxford" meant Morgan's flotilla was too small to attempt an attack on Cartagena. Instead he was persuaded by a French captain under his command to repeat the actions of the pirate François l'Olonnais two years previously: an attack on Maracaibo and Gibraltar, both on Lake Maracaibo in modern-day Venezuela. The French captain knew the approaches to the lagoon, through a narrow and shallow channel. Since l'Olonnais and the French captain had visited Maracaibo, the Spanish had built the San Carlos de la Barra Fortress, outside the city, on the approach. Talty states that the fortress was placed in an excellent position to defend the town, but that the Spanish had undermanned it, leaving only nine men to load and fire the fortress's 11 guns. Under covering cannon fire from the privateer's flagship, "Lilly", Morgan and his men landed on the beach and stormed the fortification; they found it empty when they eventually breached its defences. A search soon found that the Spanish had left a slow-burning fuse leading to the fort's powder kegs as a trap for the buccaneers, which Morgan extinguished. The fort's guns were spiked and then buried so they could not be used against the privateers when they returned from the rest of their mission.