Thorongil often counselled Ecthelion that the strength of the rebels in Umbar was a great peril to Gondor, and a threat to the fiefs of the south that would prove deadly, if Sauron moved to open war. At last he got leave of the Steward and gathered a small fleet, and he came to Umbar unlooked-for by night, and there burned a great part of the ships of the Corsairs.
Tolkien, J.R.R.. Appendix A. (New York: Houghton Mifflin, 1993.) 1092










