Fleetwood was a strong and unswerving follower of Cromwell's policy. He supported Cromwell's assumption of the position of
Lord Protector and his dismissal of the parliaments. In December 1654 he became a member of the council, and after his return to England in 1655 was appointed one of the
administrative major-generals. He approved of the
Humble Petition and Advice, only objecting to the conferring of the title of "king" on Cromwell; became a member of the
new House of Lords; and supported ardently Cromwell's foreign policy in Europe, based on religious divisions, and his defence of the
Protestants persecuted abroad. He was therefore, on Cromwell's death, naturally regarded as a likely successor, and it is said that Cromwell had in fact so nominated him. He, however, gave his support to
Richard Cromwell's assumption of office, but allowed subsequently, if he did not instigate, petitions from the army demanding its independence, and finally (with the aid of the other officers in the
Wallingford House party) compelled Richard by force to dissolve the
Third Protectorate Parliament. His project of re-establishing Richard in close dependence upon the army met with failure, and he was obliged to recall the
Rump Parliament on 6 May 1659. He was appointed immediately a member of the
Committee of Safety and of the
Council of State, and one of the seven commissioners for the army, while on 9 June 1659 he was nominated
commander-in-chief. In reality, however, his power was undermined and was attacked by parliament, which in October declared his commission void. The next day he assisted
John Lambert in his expulsion of the Rump Parliament and was reappointed commander-in-chief. ==Collapse of the Protectorate and Restoration of the Monarchy==