The Cornish rising seemed to decide the fortune of the war; and the succours which his queen was bringing him from the army of the North determined Charles to make a fresh advance upon London. He was preparing for this advance, when Rupert sallied from Oxford to beat up the quarters of the army under Essex, which still remained encamped about Thame. Foremost among this Parliamentary force were the "Greencoats" of John Hampden. From the first outbreak of warfare Hampden had shown the same energy in the field that he had shown in the Parliament. He had contributed two thousand pounds to the loan raised by the Houses for the equipment of an army. He had raised a regiment from among his own tenantry, with the parson of Great Hampden for their chaplain. The men wore his livery of green, as those of Holles or Brooke or Mandeville wore their leaders' liveries of red, and purple, and blue; the only sign of their common soldiership being the orange scarf, the colour of Lord Essex, which all wore over their uniform. From the first the "Greencoats" had been foremost in the fray. While Essex lay idly watching the gathering of an army round the king, Hampden was already engaged with the royal outposts. It was the coming up of his men that turned the day at Edgehill; and that again saved Lord Brooke from destruction in the repulse of the royal forces at Brentford. It was Hampden's activity that saved Reading from a second capture. During the gloomy winter, when the fortunes of the Houses seemed at their worst, his energy redoubled. His presence was as necessary in the Parliament as in the field; and he was continually on the road between London and Westminster. It was during these busy months that he brought into practical shape a league which was destined to be the mainstay of the Parliamentary force. Nowhere was the Puritan feeling so strong as in the counties about London, in his own Buckinghamshire, in Hertfordshire, Bedfordshire, and the more easterly counties of Huntingdon, Cambridge, and Northampton. Hampden's influence as well as that of his cousin, Oliver Cromwell, who was already active in the war, was bent to bind these shires together in an association for the aid of the Parliament, with a common force, a common fund for its support, and Lord Manchester for its head. The association was at last brought about; and Hampden turned his energies to reinforcing the army of Essex. [Sidenote: Rupert's raid.]