In May, Prince Rupert left Shrewsbury, and marched north, capturing Liverpool and Bolton en route. To avoid being shut up in Oxford, a field army nominally commanded by Charles retreated to Worcester; Essex ordered Waller to remain there, while he went west to relieve the siege of Lyme Regis. On 29 June, Waller clashed with Charles at Cropredy Bridge; although losses were minimal, his men were demoralised, and the army disintegrated, allowing Charles to pursue Essex into the West Country.