 His military skills, combined with the tactics of the Dewan of Travancore, Ramayyan Dalawa, and statesmanship of Maharaja Marthanda Varma proved very effective in the future military exploitations and annexations of the Northern kingdoms up to Cochin over a period of time.They defeated and annexed Quilon, Kayamkulam, Kottarakkara, Pandalam, Ambalapuzha, Edappalli, Thekkumkoor and Vadakkumkoor with Travancore.Captain De Lannoy's military skills and loyalty were recognised not only by the king and his state officials, but also by the subjects of Travancore, who called him by the nom de guerre ""Valiya Kappithaan "", meaning 'The Great Captain'.