In November 1642 the English Parliament, unsuccessful in war, appealed to Scotland for armed aid; in December Charles took the same course.
The Commission of the General Assembly, and the body of administrators called Conservators of the Peace, overpowered the Privy Council, put down a petition of Montrose's party (who declared that they were bound by the Covenant to defend the king), and would obviously arm on the side of the English Parliament if England would adopt Presbyterian government.

They held a Convention of the Estates (June 22, 1643); they discovered a Popish plot for an attack on Argyll's country by the Macdonalds in Ireland, once driven from Kintyre by the Campbells, and now to be led by young Colkitto.

While thus excited, they received in the General Assembly (August 7) a deputation from the English Parliament; and now was framed a new band between the English Parliament and Scotland.

It was an alliance, "The Solemn League and Covenant," by which Episcopacy was to be abolished and religion established "according to the Word of God." To the Covenanters this phrase meant that England would establish Presbyterianism, but they were disappointed.

The ideas of the Independents, such as Cromwell, were almost as much opposed to presbytery as to episcopacy, and though the Covenanters took the pay and fought the battles of the Parliament against their king, they never received what they had meant to stipulate for,--the establishment of presbytery in England.