The battle of Leeds took place during the First English Civil War on 23 January 1643, when a Parliamentarian force attacked the Royalist garrison of Leeds, Yorkshire. The attack was partly dictated by the need to maintain local support for the Parliamentarian cause; the Earl of Newcastle had recently shifted the balance of power in Yorkshire in the Royalists' favour with the addition of his 8,000-strong army, and sent one of his commanders, Sir William Savile to capture Leeds. The West Riding of Yorkshire relied on the cloth trade, and Ferdinando, Lord Fairfax sent his son, Sir Thomas Fairfax to bolster the defences of nearby Bradford, before agreeing to his request to attack Leeds.