Charles now engaged in separate negotiations with different factions. Presbyterian English Parliamentarians and the Scots wanted him to accept a modified version of the Newcastle Propositions, but in June 1647, Cornet George Joyce of the New Model Army seized Charles, and the army council pressed him to accept the Heads of Proposals, a less demanding set of terms which, crucially, did not require a Presbyterian reformation of the church. He rejected these as well however, and instead signed an offer known as the Engagement, which had been thrashed out with the Scottish delegation, on 26 December 1647. Charles agreed to confirm the Solemn League and Covenant by Act of Parliament in both kingdoms, and to accept Presbyterianism in England, but only for a trial period of three years, in return for the Scots' assistance in regaining his throne in England.