The Battle of Muster Green (also known as the Battle of Haywards Heath) was a minor battle of major significance that took place during the first week of December 1642 on and around the then much larger Muster Green in Haywards Heath during the first year of the First English Civil War. A Royalist army under Colonel Edward Ford, High Sheriff of Sussex, marching from Chichester to seize Lewes for the King encountered a smaller but more disciplined Parliamentarian army under Colonel Herbert Morley waiting for them on Muster Green.