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When the quarrel between the Army and Parliament began, Lambert supported the Army's cause. He assisted Henry Ireton in drawing up the addresses and remonstrances issued by the Army, as both of them had some experience in law. Early in August 1647 Lambert was sent as Major-General to take charge of the forces in the northern counties. He suppressed a mutiny among his troops, kept strict discipline and hunted down bandits who infested the Scottish countryside.

When the quarrel between the Army and Parliament began, Lambert supported the Army's cause. He assisted Henry Ireton in drawing up the addresses and remonstrances issued by the Army, as both of them had some experience in law. Early in August 1647 Lambert was sent as Major-General to take charge of the forces in the northern counties. He suppressed a mutiny among his troops, kept strict discipline and hunted down bandits who infested the Scottish countryside.

At the start of the Second English Civil War Lambert now a young general of twenty-nine, was more than equal to the situation. He had already left the sieges of Pontefract Castle and Scarborough Castle and hurried into Cumberland to deal with the English Royalists. With his cavalry he got into touch with the enemy about Carlisle and slowly fell back, fighting small rearguard actions to annoy the enemy and gain time, to Bowes and Barnard Castle. Langdale, the Royalist commander, did not follow him into the mountains, but occupied himself in gathering recruits and supplies of material and food for the Scots. Lambert, reinforced from the Midlands, reappeared early in June and drove him back to Carlisle with his work half finished. About the same time the local horse of Durham and Northumberland were put into the field by the Governor of Newcastle, and won a considerable victory for the Roundheads (30 June) at the River Coquet. ''Lambert in the north''.}}

At the start of the Second English Civil War Lambert now a young general of twenty-nine, was more than equal to the situation. He had already left the sieges of Pontefract Castle and Scarborough Castle and hurried into Cumberland to deal with the English Royalists. With his cavalry he got into touch with the enemy about Carlisle and slowly fell back, fighting small rearguard actions to annoy the enemy and gain time, to Bowes and Barnard Castle. Langdale, the Royalist commander, did not follow him into the mountains, but occupied himself in gathering recruits and supplies of material and food for the Scots. Lambert, reinforced from the Midlands, reappeared early in June and drove him back to Carlisle with his work half finished. About the same time the local horse of Durham and Northumberland were put into the field by the Governor of Newcastle, and won a considerable victory for the Roundheads (30 June) at the River Coquet. ''Lambert in the north''.

This reverse, coupled with the existence of Langdale's force on the Cumberland side, compelled Hamilton, the Scottish Royalist commander to choose the west coast route for his advance, and his army began slowly to move down the long passageway between the mountains and the sea. The campaign which followed is one of the most brilliant in English history. When the Scottish army under James Hamilton invaded England in the summer of 1648, Lambert was obliged to retreat; but Lambert continued to harass the invaders till Cromwell came up from [[Wales]] and the Scottish army was destroyed in the three days' fighting at the Battle of Preston fought  near Preston in Lancashire. After the battle Lambert's cavalry headed the chase, pursuing the defeated army, and finally surrounded it at Uttoxeter, where Hamilton surrendered to Lambert on 25 August 1648. Lambert then led the advance of Cromwell's army into Scotland, where he was left in charge on Cromwell's return. From December 1648 to March 1649 he was engaged in the successful siege of Pontefract Castle; Lambert was thus absent from London at the time of Pride's Purge and the trial and execution of King Charles I of England.

This reverse, coupled with the existence of Langdale's force on the Cumberland side, compelled Hamilton, the Scottish Royalist commander to choose the west coast route for his advance, and his army began slowly to move down the long passageway between the mountains and the sea. The campaign which followed is one of the most brilliant in English history. When the Scottish army under James Hamilton invaded England in the summer of 1648, Lambert was obliged to retreat; but Lambert continued to harass the invaders till Cromwell came up from [[Wales]] and the Scottish army was destroyed in the three days' fighting at the Battle of Preston fought  near Preston in Lancashire. After the battle Lambert's cavalry headed the chase, pursuing the defeated army, and finally surrounded it at Uttoxeter, where Hamilton surrendered to Lambert on 25 August 1648. Lambert then led the advance of Cromwell's army into Scotland, where he was left in charge on Cromwell's return. From December 1648 to March 1649 he was engaged in the successful siege of Pontefract Castle; Lambert was thus absent from London at the time of Pride's Purge and the trial and execution of King Charles I of England.