[1] Cary like his father and elder brother, had Royalist sympathies and during the early years of the Interregnum his movements were monitored by the Council of State, but after William Lockhart of Lee, the Protector's ambassador in Paris, had assessed him, he was no longer perceived to be a serious threat to the new establishment.
[2] During the debates over the Indemnity and Oblivion Bill Cary "took a strong line towards the regicides, and argued that any member who had sat in the high court of justice should be excluded from the house.
Regarding individual parliamentarians, he wished to make William Sydenham and John Pyne liable for any penalty short of death, and he opposed the limited punishment proposed for Francis Lascelles.
"[2] In June 1660, shortly after the Restoration of King Charles II Cary was made a colonel of horse and gentleman of the privy chamber.
In August 1662 he was elected to the Irish parliament for Fore and spent some time there, and in October 1662, after his regiment was disbanded, he was appointed captain of a troop of horse in Ireland.