In 1815, Guillermo Brown, an Irish Marine Commodore serving in the United Provinces of the Río de la Plata, launched a campaign to harass the Spanish fleet in the Pacific Ocean. When rounding Cape Horn aboard the Hercules and Trinidad, strong winds pushed them to parallel 65 S. Some Argentine sources say that Brown had sighted Antarctic land on the expedition, saying that it is the reason why Argentine cartography often calls the northernmost part of the Antarctic Peninsula Tierra de la Trinidad.[10][11]