The USS Boston under Captain McNeill had been sent to Tripoli to blockade the port and prevent any ships from entering or leaving. Leaving for Tripoli in January she discovered that four Swedish ships had already begun a blockade of the port. Along with the Swedish vessels she attempted to chase down corsairs attempting to break the blockade with little success, as the Swedish vessels were quite large and cumbersome making it difficult for them to pursue the small Tripolitan galleys that darted in and out of the port's harbor.