War thus begun was waged without mercy, and one bloody episode followed on the heels of another. At the head of his clansmen, Lachlan swept into Argyle's country and made him cry quits. This was a large achievement, and the spirited young Lord of Duart was hailed as a Highland chief worthy of the king's favor. He went to court, was flattered by the great men there, and became the hero of as pretty and gallant a romance as heart could wish. The king arranged that he should marry the daughter of the powerful Earl of Athol, and Lachlan could not say his sovereign nay. The contract arranged, he started for Mull to make ready for the wedding, but chanced to visit on the way William Cunningham, Earl of Glencairn, at his castle overlooking the Clyde.
Cards were played to while away the evening, and Lachlan's partner was one of the daughters of the host. It so happened that the game was changed and the players again cut for partners. At this another daughter, the fair Margaret Cunningham, whispered to her sister that if the handsome Highland chief had been her partner, "she would not have hazarded the loss of him by cutting anew." Lachlan overheard the compliment, as perhaps he was meant to do, and so far as he was concerned hearts were trumps from that moment. He wooed and won Margaret Cunningham and married her forthwith. The king was greatly offended but what cared this happy man! He carried his bride to Duart and laughed at his foes.
The quiet life at home was not for him, however. Soon he was playing the game of the sword with the MacDonalds of Islay until a truce was patched by means of a marriage between the clans. There was peace for a time, but the trouble blazed anew over the matter of some lifted cattle, and they were at it again hammer-and-tongs. The royal policy seems to have been to permit these Highland gamecocks to fight each other so long as they were fairly well matched. In this case the various MacDonalds combined in such numbers against Lachlan MacLean that the king interfered and persuaded them to seek terms of reconciliation. Accordingly the Lord of the MacDonalds journeyed to Duart Castle with his retinue of bare-legged gentlemen and was hospitably received. Lachlan was canny as well as braw, and he clinched the terms of peace by first locking the visitors in a room whose walls were some twenty feet thick, and then holding as hostages the two young sons of Angus MacDonald.
The high-tempered MacDonald was naturally more exasperated than pacified, and he turned the tables when Lachlan soon after went to Islay to receive performance of the promises made touching certain lands in dispute. The Highland code of honor was peculiar in that treachery appears to have been a weapon used without scruple. The MacDonalds swore that not a MacLean should suffer harm, but no sooner had Lachlan and his clansmen and servants arrived than they were attacked at night by a large force. The party would have been put to the sword, but that Lachlan rushed into the midst of the foe holding aloft one of MacDonald's sons as a shield.
This caused postponement of the slaughter, MacDonald offering quarter if his child should be delivered to him. The MacLeans were disarmed and bound, except two young men who had distinguished themselves by laying many a MacDonald low in the heather. These were beheaded at once, and beginning next morning two MacLeans were led out and executed each day in the presence of their own chief until no more than Lachlan and his uncle were left. They were spared only because the sanguinary Angus MacDonald fell from his horse and was badly hurt before he could finish his program.