 In 1811, he captained the "William Penn", but the ship was captured in 1813.Later, George made three whaling voyages on the "Globe" (1815–18; 1818–21; 1821–22), and two on the "Maria" (1822–25; 1825–28).In 1818 George discovered the "Offshore Ground" (5° to 10°S and 105° to 125°W).