Gondor attacked by Corsairs
Event Type: Military/Strategic
Age: 3rd Age - The Stewards
Years: 2758 ~ 2759
"In the days of Beren, the nineteenth Steward, an even greater peril came upon Gondor. Three great fleets, long prepared, came up from Umbar and the Harad, and assailed the coasts of Gondor in great force; and the enemy made many landings, even as far north as the mouth of the Isen."
RotK, Appendix A, I, iv, Gondor and the Heirs of Anarion
The invasion is said to have started before the Long Winter, which began in November. By the time winter ended in March Beren had defeated the Corsairs.