Gregory made one effort of eighteen miles across the red sand dunes, but his 'horses were not equal to the task, and he returned to his camp at the foot of the range. After resting for a day, he started with two companions for a final attempt, leaving the remainder camped to await his return, with instructions, if the water failed, to fall back on the Oakover. This excursion nearly proved fatal; the heat was something terrible, and when well advanced in the sand ridges, the horses gave in altogether. Afar to the east, a distant range was faintly visible, and a granite range could be seen to the south, about ten miles distant. These granite hills were their only hope, and to them they turned. Across the sand hills now, instead of running parallel with them, the horses at once gave up, and, leaving his comrades to drive them on as best they could, Gregory pushed towards the goal on foot, but when he reached it no sign of verdure or moisture greeted him. Blasted, scorched, and barren the rocks and rugged ravines lay before him, and all his weary searching resulted only in his completely breaking down with distress and fatigue. When his companions came up with the dying horses there was nothing to do but make preparations to get back as soon as they could to the depôt, trusting that the want of water might not have compelled the main party to abandon the camp. By dawn the wearied men commenced their retreat, but when the heat of the day set in, the poor, thirsty horses of course began to fail; and Gregory, too, was so completely exhausted with his previous day's efforts that he could not keep up with the other two. One of the party, Brown, started on ahead with the horses, the other remaining with Gregory to follow more slowly. Brown had to abandon nearly everything to get the wretched animals on, finally reaching the camp with only one; but fortunately he found the party still there. He started back at once, with fresh horses, to meet the others, and recover the equipment; but two of the horses were never found. Gregory was now convinced that the sandy tract before him was not to be crossed with the means at his command, so that, reluctantly, he had to give way and turn to the northward, to follow down the Oakover. They found the country fertile, and the river abounding with water; and on the 18th September reached the junction of De Grey with the Oakover. Down the united streams, henceforth bearing the name of the De Grey only, the explorers travelled through fair, open land, the course of the river flowing now to the westward, until the coast was reached on the 25th. From here the party made back to their rendezvous at Nickol Bay, crossing once more the Yule and the Sherlock, rivers named on their outward journey. On the 17th October the ship was reached, and they were taken on board.