London's alignment with parliament in the English Civil War was never a foregone conclusion. Indeed, the City, which historians have long identified as a stronghold for parliament, could scarcely be called 'parliamentarian'. Within this contradiction resides a fundamental question: how and why did the largely conservative City provide much of the financial and military support needed to wage an effective war against Charles I?For the first time, Civil War London reveals the dynamics of London's support for parliament, investigating the series of episodic, circumstantial, and ultimately unique mobilisations that permitted war to be maintained from the outbreak of the Irish rebellion in late 1641 through to the establishment of the New Model Army in early 1645. In other words, it tells the story of the movement of money and men for parliament. Supported by research from two-dozen archives, the book charts the successes and failures of London's financial and military mobilisations and countermobilisations, challenging longstanding notions about the wartime capital. Revealed in the process are interactions between London's Corporation, parochial communities and livery companies, between preachers and parishioners, and between agitators, propagandists, and common people.Within these tangled webs of political engagement reside the untold stories of the movement of money and men, but also of parliament's eventual success in the English Civil War.