The orthodox view of modern writers that armies of the 17th century relied more upon plunder and free quarter is highly pervasive, yet more recent research suggests that during the British Civil Wars there were increasing changes to this custom. The creation, politics, religious identity, officer corps and military campaigns (especially the Battle of Naseby) of the New Model Army, commanded by Sir Thomas Fairfax, have been the focus for various writers, nonetheless, little attention has been paid to the supply and logistics of this force. The result has been a critical gap in the understanding of the recruitment, victualling, ordnance, ammunition, clothing, arming, and logistics employed by the Committee of the Army in both the initial establishment of the New Model and its subsequent campaigns. The methods of sustaining this military force of up to 17,000 men in the field necessarily called for a largely centralised system which operated at an increasingly physical distance from London and the army’s headquarters at Reading. Hence, this study challenges the prevailing view that Fairfax’s troops increasingly relied upon local sources during 1645 and 1646, rather than an organized system of supply from London manufacturers and other commercial means. Hence, this highly relevant and important topic adds significantly to our knowledge of the supply, strengths and appearance of the New Model, and will appeal to academics, local historians, re-enactors and wargamers.