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Why was control of London important to the Parliamentarians?

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Painting of the Battle of Naseby shows cavalry and infantry clashing, with soldiers on horseback leading a charge and fallen fighters on the ground amid the chaos of battle. — English Civil Wars *Battle of Naseby*, by an unknown artist. The victory of the Parliamentarian New Model Army, under Sir Thomas Fairfax and Oliver Cromwell, over the Royalist army, commanded by Prince Rupert, at the Battle of Naseby (June 14, 1645) marked the decisive turning point in the English Civil War.

Control of London was vital to the Parliamentarians during the English Civil Wars primarily because the city served as the kingdom's financial capital. By maintaining control over London, Parliament secured access to essential economic resources necessary to fund their war effort.1

Furthermore, London functioned as a core of parliamentary support, with the city's allegiance playing a significant role in the ultimate success of the Roundheads. The city was a fortified stronghold, and its local militia, known as the trainbands, served as a powerful deterrent against Royalist forces, notably preventing Charles I from capturing the city in 1642. Because London was the financial and political heart of the nation, it was a strategic objective that Charles I consistently failed to seize, which proved critical to the Parliamentarian victory.21