The army, having vanquished all opposition, went on to change the whole form of government; and to make way for it determined to impeach the King of high treason, as having been the cause of all the blood that had been spilt in the late war.
There was commotion in the House and in town and the country. In the House some declared that there was no need to bring the King to trial; others said that there existed no law by which he could be tried; but all this was overruled.
Meanwhile Hugh Peters was not idle. In a sermon addressed to the members of the two Houses a few days before the King's trial he said: "My Lords, and you noble Gentlemen,—It is you we chiefly look for justice from. Do you prefer the great Barabbas, Murderer, Tyrant, and Traitor, before these poor hearts (pointing to the red coats) and the army who are our saviour?"
In another sermon before Cromwell and Bradshaw he said: "There is a great discourse and talk in the world, What, will ye cut off the head of a Protestant Prince? Turn to your Bibles, and ye shall find it there, Whosoever sheds man's blood, by man shall his blood be shed. I see neither King Charles, Prince Charles, Prince Rupert, nor Prince Maurice, nor any of that rabble excepted out of it."
Evelyn in his Diary, under date 17th January, 1648-9, says: "I heard the rebel Peters invite the rebel powers met in the Painted Chamber to destroy his Majesty." Bishop Burnet says: "That he (Peters) had been outrageous in pressing the King's death with the cruelty and rudeness of an inquisitor."
Prynne, one of the secluded members, published "A brief memento to the present unparliamentary junto, touching their present intentions and proceedings to depose and execute Charles Stuart, their lawful King of England."
The officers now decided to gain the approval of the ministers—Presbyterian—in London, or at least persuade them to remain neutral.
Hugh Peters was selected for the purpose, and he went among them, but all his efforts were fruitless. They declared unanimously for the release of the King. He then invited several of them, Calamy, Whitaker, Sedgwick, etc., to a conference with some of the officers; but instead of attending, the ministers assembled in Sion College and drew up "A serious and faithful representation of the judgment of the ministers of the Gospel within the province of London," dated 18th January, 1648-9. In this they protested against the coercive measures adopted toward the Parliament, and bade them beware of proceeding to extremities. "Examine your consciences, if any number of persons of different principles from yourselves had invaded the rights of Parliament, imprisoned the King, and carried him about from place to place, and attempted the dissolution of the whole government, whether you would not have charged them with the highest crimes."
This was subscribed by forty-seven ministers.
A second paper, "A vindication of the London ministers from the unjust aspersions ... as if they had promoted the bringing of the King to capital punishment," appeared shortly after, signed by fifty-seven ministers.