Kammala jumla mai zuwa: Rushworth ya bi jagorancin John Pym, wanda, a cikin wani jawabi a cikin House of Commons a ranar 17 ga Afrilu, 1640, ya kai hari ga Sarki da gwamnatinsa don matsalolin da ke cikin kasar. Bayan barkewar yakin basasa, Rushworth a matsayin "dan jarida mai sakawa" ya bi yakin Edge Hill (1642), Newbury (
1643 da 1644), Marston Moor (1644) da Naseby (1645). A shekara ta 1645 ya zama sakatare ga Thomas Fairfax, kwamandan kwamandan New Model Army. Lokacin da aka kama Charles I, Rushworth ya fara rubuta cikakkun bayanai game da abubuwan da suka faru kafin, lokacin da kuma bayan shari'ar da hukuncin kisa na Sarki. Ya ruwaito yakin Preston (1648) da kuma yakin Worcester (1651).