At the opening of the
Long Parliament he distinguished himself in defence of the
Presbyterian polity, in contributing to the joint conciliatory work known as
Smectymnuus. It argued against Bishop
Joseph Hall's presentation of
episcopacy, while articulating the Presbyterian positions. The initials of the names of the contributors formed the name under which it was published, viz.,
Stephen Marshall (SM), Edmund Calamy (EC),
Thomas Young (TY),
Matthew Newcomen (MN), and
William Spurstow (WS, then often written VVS equivalent to UUS). These were clerical leaders of the Presbyterian movement within the
Church of England. At the same period Calamy was an influential evangelical preacher, calling in December 1641 for a preaching ministry throughout England. Calamy was an active member in the
Westminster Assembly of divines, set up in 1643. In that year he edited the ''
Souldier's Pocket Bible'', a popular Biblical anthology designed for the Parliamentarian military forces. The Smectymnuans were against
religious tolerance and Calamy strongly advocated checking independent religious thinkers in 1644, attracting allies such as
Lazarus Seaman. Refusing to advance to
Congregationalism, he found within Presbyterianism a middle course which best suited his views of theology and church government. Calamy belonged to the hypothetical universalist group in the Assembly, those influenced by
John Davenant or his reading of the
Synod of Dort.
Richard Baxter reported that Calamy, Lazarus,
Richard Vines and
John Arrowsmith were not hostile to
universal redemption. In 1647 he worked on the Assembly's Catechism. In 1648 he was preaching at
St Benet Fink, to find an adversarial atmosphere in which the Baptist
Edward Barber had been invited to contradict him. He opposed the execution of King
Charles I, and lived quietly under the Commonwealth. Asked for advice by
Oliver Cromwell on the dissolution of the
Rump Parliament and the establishment of a Protectorate, he replied that nine out of ten would oppose it. ==After the Restoration==