Why did sieges and small skirmishes dominate much of the first English Civil War?

During the first English Civil War, sieges and small skirmishes dominated the military landscape because both Royalist and Parliamentarian forces were primarily focused on securing territory and destroying their opponent's economic base while simultaneously attempting to preserve their own limited resources.1

At the start of the conflict, neither side possessed a decisive advantage, and both struggled with the logistical challenges of recruiting, equipping, and supplying their armies. Because local garrisons were tasked with controlling key areas and resources, the war devolved into a series of localized struggles rather than a sequence of large-scale pitched battles. Furthermore, the lack of a centralized, professional military force meant that armies were often composed of inexperienced troops and local militias who were frequently reluctant to fight outside their own counties. This stalemate persisted until the creation of the New Model Army in 1645, which provided Parliament with the centralized funding, direction, and mobility necessary to move beyond localized skirmishing and deliver the decisive blows that ultimately ended the war.12