 A new Royalist offensive in late 1643 saw skirmishing around Farnham between Waller's forces and Ralph Hopton's Royalists, but these brief incursions into the western fringes of Surrey marked the limits of Royalist advances on the county.At the end of 1643 Surrey combined with Kent, Sussex and Hampshire to form the South-Eastern Association, a military federation modelled on Parliament's existing Eastern Association.In the uneasy peace that followed the Royalists' defeat, a political crisis in summer 1647 saw Sir Thomas Fairfax's New Model Army pass through Surrey on their way to occupy London, and subsequent billeting of troops in the county caused considerable discontent.