While the Scottish army was thus aiding the Parliamentary cause, the Earl of Montrose had created an important diversion on the king's side in Scotland itself. In April, 1644, he occupied Dumfries and made an unsuccessful attempt on the Scottish Lowlands. In May Charles conferred on him a marquisate, and in August he prepared to renew the struggle. To his old foes, the Gordons, he first looked for assistance, but was finally compelled to raise his forces in the Highlands, and to obtain Irish aid. On September 1st he gained his first victory at Tippermuir, near Perth, on which he had marched with his Highland host. From Perth he marched on Aberdeen, gaining some reinforcements from the northern gentry, and in particular from the Earl of Airlie. Once again Montrose fought a battle which delivered the city of Aberdeen into his power (September 13th), but now he was unwilling or unable to protect the captured town, which was cruelly ravaged. From Aberdeen Montrose proceeded by Rothiemurchus to Blair Athole, but suddenly turned backwards to Aberdeenshire, where he defended Fyvie Castle, slipped past Argyll, and again reached Blair Athole. The enemies of Argyll crowded to his banner, but his army was still small when, in December, 1644, he made his descent upon Argyll, and reached the castle of Inverary. From Inverary he went northwards, ravaging as he went, till he found, at Loch Ness, that there was an army of 5000 men under the Earl of Seaforth prepared to resist his advance, while Argyll was behind him at Inverlochy. Although Argyll's army considerably outnumbered his own, Montrose turned southwards and made a rapid dash at Argyll's forces as they lay at Inverlochy, and won a complete victory, the news of which dispersed Seaforth's men and enabled Montrose to invite Charles to a country which lay at his mercy. At Elgin he was joined by the heir of the Marquis of Huntly, his forces increased, and the excommunication which the Church immediately published against him seemed of but little importance. On April 4th he seized Dundee, and on May 9th won a fresh victory at Auldearn, which was followed, in rapid succession, by a victory at Alford in July, and in August by the "crowning mercy" of Kilsyth, which made him master of the situation, and forced Leven to raise the siege of Hereford. From Kilsyth he marched to Glasgow, where both the Highlanders and the Gordons began to desert him. From England, Leven sent David Leslie to meet Montrose as he marched by the Lothians into the border counties. On September 13th, 1645, just one year after his victory at Aberdeen, Montrose was completely defeated at Philiphaugh. He escaped, but his power was broken, and he was unable henceforth to take any important share in the war.