[4] Blair Worden describes Hall as "elusive" in the period from 1649, but points out parallels with the political development in the views of John Milton.

His friend John Davies states that Hall was awarded a pension of £100 per annum by Cromwell and the council for his pamphleteering services.

Commendatory verses in English were prefixed;[6] Henry More contributed Greek elegiacs; and Hall's tutor, John Pawson, wrote a preface.

[7] The prose works of William Drummond of Hawthornden were published through the efforts of Sir John Scott of Scotstarvet, his brother-in-law, and Hall edited the History of Scotland (1655), writing a preface.

In it he complains that the revenues of the universities are misspent and the course of study is too restricted; he advocates that the number of fellowships should be reduced and more professorships endowed.

With his other works of the period, it helped catch the eye of the political agent Gualter Frost and forward his career as a state-paid writer.

Journalism of this period was venal, and writers for hire, and he was paid by William Lilly the astrologer to further his verbal feud with George Wharton.

Hall's writing style and Nedham's are judged very similar; and they are believed to have colluded covertly to take opposite points of view.

In Scotland he drew up The Grounds and Reasons of Monarchy, with an appendix of An Epitome of Scottish Affairs, printed at Edinburgh and reprinted at London.