Bramhall's historical importance lies in his writing while in exile. Without office, he turned his hand to writing replies to all attacks on the Anglican church. In 1643, he wrote "Serpent Salve," a defence of episcopacy and monarchy against the attacks of the Puritan presbyterian model and democracy. He followed this with his 1649 "Fair Warning against the Scottish Discipline," which was an attack on the weaknesses of the presbyterian model and an excoriation of the Puritan religious claims. He also attacked and defended against Hobbes's "Leviathan." In 1655, Bramhall wrote "Vindication of True Liberty." Hobbes replied to Bramhall with "Animadversions," and Bramhall replied to this with "Castigation of Hobbes' Animadversions" (with an afterpiece called "The Catching of Leviathan, the Great Whale") in 1658.