But when spring came again—a spring so fair and sweet that it was as though May had come hand in hand with February—a rumour reached them that the King of Alba, though he could not penetrate the highlands of the west, intended, with the help of Fergus of the Duns and other chieftains, to proceed once more against the Dun of Usna. Moreover, he had sworn to raze it to the ground, and to slay Nathos, and to take Darthool to be his wife.

Nathos laughed at this, for he knew well that the King of Alba would never take him alive, nor yet Darthool. But after long colloquy with Ailne and Ardan, all decided to set forth and pass northward to the land whence their mother had come, a land of endless mountains and narrow lochs, beautiful beyond any other, grander than any Darthool had seen, and remote beyond the reach of any Alban king.

So thither they set forth, and took with them in their great galley two score and ten men of their own clan. After long sailing up narrow lochs, the sons of Usna reached the mountain land whence their mother had come. Her father was dead, but the great dun he had built upon the summit of one of the hills overlooking the Black Loch had been left unharmed, and was tenanted only by wandering shepherds. Here Nathos and Darthool made their home, and in that beautiful land and in the glory of spring, knew the full joy and richness of life.[20]

For a brief while all the people of the mountain lands round about gave in their adherence to Nathos, so that he became as a king in that region. So great was the fear in which the three sons of Usna were held, and so strong were they in their mountain home, that none dared to approach them with the flaming brand.

Thus three years passed, and in all the wide reaches of the world there was no man so happy as Nathos and no woman so happy as Darthool; and after these there were none so happy as Ailne and Ardan, who were well content to live so that they might be near the beautiful wife of Nathos, their sister, Darthool, fairest of all women in the world.

The King of Alba, whom they had feared, was now dead, and the king who reigned in his place was well disposed towards the sons of Usna and sought their alliance. So this was done, and the name and fame of the three brothers spread throughout the land; while from the wild west to the populous east the poets sang of the beauty of Darthool.

In the summer months they abode at the high fort of Darthool, for so they named it, on the heights above the Black Loch, or Loch Ness as we now call it; and from the first frosts till the cuckoo’s song had ceased they lived at Dunuisneachan, their father’s ancient stronghold by the shores of Loch Etive. Thence often they wandered far afoot, or sailed southward and eastward among the sea-lochs and narrow kyles. They hunted in Glenorchy and fished under the mountain-shadows on Loch Awe; or followed the deer through the woods of Glenlaidhe. When it was pleasant to be upon the waters, they sailed down the long fjord of Loch Fyne, and rested awhile at the Haven of the Foray, and watched the coming and going of the rainbows on the rocky headlands which guard that place; then they would cross to the Cowal, and enter the narrow Kyles of Bute, where on the little isle we call the Burnt Island they built a vitrified fort. Thence they followed past the Hills of Ruel to Glendaruay (Glendaruel), and so to the head of Loch Striven and up Glenmassan, and thence down by the sweet inland waters of Loch Eck, and waterward again by the bay we now call the Holy Loch. Thence up the long, narrow fjord of Loch Long they sailed, till among the mountains they crossed the short pass to Loch Lomond, and perhaps met the soldiery of the King of Alba at the inland lakes, or came upon the great fort of Dumbarton on the Clyde; or they may have crossed the hill to the Gareloch, and so returned westward once more by the blue frith of Clyde, past the precipitous isle of Arran, and so up Loch Fyne again; or seaward by the Mull of Cantire, and thence northward past the isles to their own place, and could once more watch the salmon leaping through the Falls of Lora or chase the deer on the hills of Etive.

But during all this time Concobar, the high king of the Ultonians, nursed his bitter thoughts. He had heard of the great fame and happiness of the sons of Usna, and more than ever he yearned after Darthool, his wrath at his loss being the greater because that all the old prophecies about the beautiful daughter of Felim were unfulfilled.

One day the high king made a great festival in Emain Macha, and never in Erin was seen one more royal and magnificent. The princes and nobles from all the regions in the sway of Concobar were there, and all the musicians, singers, and poets in Uladh.

In the midst of the festival Concobar asked those present at his board if now, in the height of the glory of the Red Branch, they wanted for anything; but they answered as with one voice that they were content.