Madach had been equally unsuccessful in his attempt upon the earldom of Thorfin. Warned of the approach of his rival, the Jarl summoned Thorkell Fostri to join him with the Orkneymen in Caithness, and Madach, perceiving that an engagement with their united forces would only be attended with a disastrous result, retreated southwards for reinforcements, whilst Thorfin availed himself of the opportunity to overrun the neighbouring district of Ross. Intelligence of his proceedings reached the king at Berwick, deciding him to march at once towards the north, in order to support in person his grant of the earldom to Madach. It appears to have been Duncan’s object to cut off Thorfin from the Orkneys, thus preventing his junction with Thorkell Fostri and his Norwegians, whom the Jarl, on the retreat of his rival, had permitted to return to the islands; and to carry out his purpose, he despatched Madach towards Caithness with the land army, whilst with eleven vessels he sailed round Duncansby Head to interpose his ships between the Jarl and his island home; hoping thus either to force him to fight at a disadvantage with the superior numbers of Madach, or to drive him southwards upon those Highland districts which were less well affected to his cause. The sight of Duncan’s sails in the Pentland Firth conveyed to Thorfin the earliest intelligence of his enemy’s approach, and, baffled in an attempt to put to sea, and thus escape to Sandwick, he was forced to lie off Dyrness for the night and to await the king’s attack on the following morning.[138] The ships of Thorfin were laden with the plunder of the northern provinces of Scotland, and his men fought so desperately in defence of their booty, that the king was beaten off and obliged to make for the coast of Moray, whither he was speedily followed by the united forces of Thorfin and Thorkell Fostri; the Jarl watching the movements of Duncan and collecting reinforcements from Caithness, Sutherland, and Ross, whilst he dispatched Thorkell to surprise Madach, who had now reached Thurso, where he was resting in unguarded security. The fidelity of the men of Caithness ably seconded the projects of their Jarl, so effectually concealing the approach of Thorkell, that the first notice of danger was conveyed to the unfortunate Madach by the flames of his burning house, and he perished in a vain attempt to burst through the ranks of his enemies, and escape from the blazing ruins.