In the meantime Waller had reduced Portsmouth,[b] while Essex concentrated his force, amounting to fifteen thousand men, in the vicinity of Northampton. He received orders from the houses to rescue, by force[c] if it were necessary, the persons of the king, the prince, and the duke of York, from the hands of those desperate men by whom they were surrounded, to offer a free pardon to all who, within ten days, should return to their duty, and to forward to the king a petition that he would separate himself from his evil counsellors, and rely once more on the loyalty of his parliament. From Northampton Essex hastened to[d] Worcester to oppose the advance of the royal army. At Nottingham the king could muster no more than six thousand men; he left Shrewsbury at the head of[e] thrice that number. By a succession of skilful manoeuvres [Footnote 1: Clarendon, ii. 16. Rushworth, v. 20, 21. Journals, v. 376,418.] [Sidenote b: A.D. 1642. Oct. 22.] [Sidenote c: A.D. 1642. Sept. 9.] [Sidenote d: A.D. 1642. Sept. 16.] [Sidenote e: A.D. 1642. Sept. 23.] [Sidenote f: A.D. 1642. Oct. 12.] he contrived to elude the vigilance of the enemy; and had advanced two days' march on the road to the metropolis before Essex became aware of his object. In London the news was received with terror. Little reliance could be placed on the courage, less on the fidelity of the trained bands; and peremptory orders were despatched to Essex, to hasten with his whole force to the protection of the capital and the parliament. That general had seen his error; he was following the king with expedition; and his vanguard entered the village of Keynton on the same evening on which the royalists halted on Edgehill, only a few miles in advance. At midnight[a] Charles held a council of war, in which it was resolved to turn upon the pursuers, and to offer them battle. Early in the morning the royal army was seen in position[b] on the summit of a range of hills, which gave them a decided superiority in case of attack; but Essex, whose artillery, with one-fourth of his men, was several miles in the rear, satisfied with having arrested the march of the enemy, quietly posted the different corps, as they arrived, on a rising ground in the Vale of the Red Horse, about half a mile in front of the village. About noon the Cavaliers grew weary of inaction; their importunity at last prevailed; and about two the king discharged a cannon with his own hand as the signal of battle. The royalists descended in good order to the foot of the hill, where their hopes were raised by the treachery of Sir Faithful Fortescue, a parliamentary officer, who, firing his pistol into the ground, ranged himself with two troops of horse under the royal banner. Soon afterwards Prince Rupert, who commanded the cavalry on the right, charged twenty-two troops of parliamentary horse led by Sir James [Sidenote a: A.D. 1642. Oct. 22.] [Sidenote b: A.D. 1642. Oct. 23.]