Later it was noted that these things happened even as the Shadow grew deep in Greenwood, and many evil things reappeared, signs of the arising of Sauron. It is true that the enemies of Gondor also suffered, or they might have overwhelmed it in its weakness; but Sauron could wait, and it may well be that the opening of Mordor was what he chiefly desired.
When King Telemnar died the White Tree of Minas Anor also withered and died. But Tarondor, his nephew, who succeeded him, replanted a seedling in the citadel. He it was who removed the King’s house permanently to Minas Anor, for Osgiliath was now partly deserted, and began to fall into ruin. Few of those who had fled from the plague into Ithilien or to the western dales were willing to return.
Tarondor, coming young to the throne, had the longest reign of all the Kings of Gondor; but he could achieve little more than the reordering of his realm within, and the slow nursing of its strength. But Telumehtar his son, remembering the death of Minardil, and being troubled by the insolence of the Corsairs, who raided his coasts even as far as the Anfalas, gathered his forces and in 1810 took Umbar by storm. In that war the last descendants of Castamir perished, and Umbar was again held for a while by the kings. Telumehtar added to his name the title Umbardacil. But in the new evils that soon befell Gondor Umbar was again lost, and fell into the hands of the Men of the Harad.
The third evil was the invasion of the Wainriders, which sapped the waning strength of Gondor in wars that lasted for almost a hundred years. The Wainriders were a people, or a confederacy of many peoples, that came from the East; but they were stronger and better armed than any that had appeared before. They journeyed in great wains, and their chieftains fought in chariots. Stirred up, as was afterwards seen, by the emissaries of Sauron, they made a sudden assault upon Gondor, and King Narmacil II was slain in battle with them beyond Anduin in 1856. The people of eastern and southern Rhovanion were enslaved; and the frontiers of Gondor were for that time withdrawn to the Anduin and the Emyn Muil. [At this time it is thought that the Ringwraiths re-entered Mordor.]
Calimehtar, son of Narmacil II, helped by a revolt in Rhovanion, avenged his father with a great victory over the Easterlings upon Dagorlad in 1899, and for a while the peril was averted. It was in the reign of Araphant in the North and of Ondoher son of Calimehtar in the South that the two kingdoms again took counsel together after long silence and estrangement. For at last they perceived that some single power and will was directing the assault from many quarters upon the survivors of Númenor. It was at that time that Arvedui heir of Araphant wedded Fíriel daughter of Ondoher (1940). But neither kingdom was able to send help to the other; for Angmar renewed its attack upon Arthedain at the same time as the Wainriders reappeared in great force.
Many of the Wainriders now passed south of Mordor and made alliance with men of Khand and of Near Harad; and in this great assault from north and south, Gondor came near to destruction. In 1944 King Ondoher and both his sons, Artamir and Faramir, fell in battle north of the Morannon, and the enemy poured into Ithilien. But Eärnil, Captain of the Southern Army, won a great victory in South Ithilien and destroyed the army of Harad that had crossed the River Poros. Hastening north, he gathered to him all that he could of the retreating Northern Army and came up against the main camp of the Wainriders, while they were feasting and revelling, believing that Gondor was overthrown and that nothing remained but to take the spoil. Eärnil stormed the camp and set fire to the wains, and drove the enemy in a great rout out of Ithilien. A great part of those who fled before him perished in the Dead Marshes.
‘On the death of Ondoher and his sons, Arvedui of the North-kingdom claimed the crown of Gondor, as the direct descendant of Isildur, and as the husband of Fíriel, only surviving child of Ondoher. The claim was rejected. In this Pelendur, the Steward of King Ondoher, played the chief part.
‘The Council of Gondor answered: “The crown and royalty of Gondor belongs solely to the heirs of Meneldil, son of Anárion, to whom Isildur relinquished this realm. In Gondor this heritage is reckoned through the sons only; and we have not heard that the law is otherwise in Arnor.’’
‘To this Arvedui replied: “Elendil had two sons, of whom Isildur was the elder and the heir of his father. We have heard that the name of Elendil stands to this day at the head of the line of the Kings of Gondor, since he was accounted the high king of all lands of the Dúnedain. While Elendil still lived, the conjoint rule in the South was committed to his sons; but when Elendil fell, Isildur departed to take up the high kingship of his father, and committed the rule in the South in like manner to the son of his brother. He did not relinquish his royalty in Gondor, nor intend that the realm of Elendil should be divided for ever.