'I trust before the end of this summer I shall be able to come to your majesty's assistance with a brave army,' he wrote; but meanwhile he dared not go to Edinburgh, where he had been sentenced to death by the Committee of Estates, and his property declared forfeited. But though the campaign had been successful beyond his expectations, yet his heart was heavy, for his eldest son had died of cold and exposure and the second was a prisoner in Edinburgh castle.
Such was the state of things when he went west again into the country of the Macdonalds, who flocked to his standard. On the other hand the Lowlanders fell off, and began to cast longing eyes at the rewards promised to those who joined the covenant. If Montrose could only have forced a battle on Baillie, who commanded the covenanting army, another victory would probably have been gained, but Baillie was wise, and declined to fight. Then the Highlanders grew sullen and impatient, and every day saw them striding over the hills to their own homes. By the time he reached Dunkeld the royal army had shrunk to six hundred foot and two hundred horse.
With this small force he entered Dundee, the great fortress of the covenant, and his men took to drinking. At that moment news was brought him that Baillie was at the gates, and with marvellous rapidity he collected his men and marched them out of the east gate as the English entered by the west. The Grampians were within a long march, and once there Montrose knew he was safe.
And, far away in Sweden and in Germany, the generals who had been trained under Wallenstein and under Gustavus Adolphus looked on, and wondered at the skill with which Montrose met and defeated the armies and the wealth arrayed against him.
But to those who had eyes to see the end was certain. It was to no purpose that he, with the aid of the Gordons, now once more on his side, gained a victory at Auldearn, between Inverness and Elgin, and another at Alford, south of the Don, which cost him the life and support of Huntly's son, lord Gordon. In vain did Ogilvies, Murrays, and Gordons swell his ranks, and the covenanting committee play into his hands by forcing Baillie to fight when the general knew that defeat was inevitable. The battle of Kilsyth had been won near Glasgow on August 14, and the day was so hot that Montrose ordered his men to strip to their shirts so that they might have no more weight to carry than was strictly necessary. Baillie was not even allowed to choose his own ground, but though he did all that man could do, the struggle was hopeless, and the Fife levies were soon in flight.
Only a year had passed since Montrose, now captain-general and viceroy of Scotland, had taken the field, and yet the whole country was subdued, largely by the help of the Irish, and of their leader Macdonald, whom he had knighted after Kilsyth. But for the royalist cause Naseby had been lost, Wales was wavering, Ireland was useless, and Montrose was not strong enough to make up for them all.
From Kilsyth, which is near Glasgow, it was easy for Macdonald to lead his men across the hills and lay waste the territories of his hereditary enemy Argyll. He would, he said, return to Montrose if he was wanted; but the marquis took the words for what they were worth, and waited to see whose turn to desert would come next. It was young Aboyne, who was tired of fighting, which had not brought him any of the rewards he thought his due, and he took with him four hundred horse and many infantry. At the end there only remained five hundred of Macdonald's Irish, who had cast in their lot with Montrose, and about one hundred horsemen. With these he marched to the south, trusting in the promises of help freely given by the great border nobles, and hoping to enter England and help the king.