Harry gathered round him a party of thirty Cavaliers, all men ready like himself to sacrifice their lives for the king. Their plan was to gather near Whitehall, where the execution was to take place, to burst through the soldiers lining the way, to cut down the guards, and carry the king to a boat in readiness behind Whitehall, This was to convey him across to Lambeth, where fleet horses were to be stationed, which would take him down to the Essex coast.

The plan was a desperate one, but it might possibly have succeeded, could the Cavaliers have gained the position which they wished. The whole of the army was, however, placed in the streets and passages leading to Whitehall, and between that place and the city the cavalry were drawn up, preventing any from coming in or going out. When they found that this was the case, the Cavaliers in despair mounted their horses, and rode into the country, with their hearts filled with grief and rage.

On the 30th, an hour after the king's execution, proclamation was made that whoever should proclaim a new king would be deemed a traitor, and a week later, the Commons, now reduced to a hundred members, formally abolished the House of Peers. A little later Lord Capel, Lord Holland, and the Duke of Hamilton were executed.