Immediately after the raising of his standard at Nottingham, the King, "aware at last that he could not rely on the inhabitants of Yorkshire, moved to Shrewsbury, at once to collect the Catholic gentry of Lancashire and Cheshire, to receive the Royalist levies of Wales, and to secure the valley of the Severn. The movement was successful. In a few days his little army was increased fourfold, and he felt himself strong enough to make a direct march towards the capital. Essex had garrisoned Northampton, Coventry and Warwick, and lay himself at Worcester; but the King, waiting for no sieges, left the garrisoned towns unmolested and passed on towards London, and Essex received peremptory orders to pursue and interpose if possible between the King and London. On the 22nd of October he was close upon the King's rear at Keynton, between Stratford and Banbury. But his army was by no means at its full strength; some regiments had been left to garrison the West, others, under Hampden had not yet joined him. But delay was impossible, and the first battle of the war was fought on the plain at the foot of the north-west slope of Edgehill, over which the royal army descended, turning back on its course to meet Essex. Both parties claimed the victory. In fact it was with the King. The Parliamentary cavalry found themselves wholly unable to withstand the charge of Rupert's cavaliers. Whole regiments turned and fled without striking a blow; but, as usual, want of discipline ruined the royal cause. Rupert's men fell to plundering the Parliamentary baggage, and returned to the field only in time to find that the infantry, under the personal leading of Essex, had reestablished the fight. Night closed the battle [which is sometimes named from Edgehill and sometimes from Keynton]. The King's army withdrew to the vantage-ground of the hills, and Essex, reinforced by Hampden, passed the night upon the field. But the Royalist army was neither beaten nor checked in its advance, while the rottenness of the Parliamentary troops had been disclosed." Some attempts at peace-making followed this doubtful first collision; but their only effect was to embitter the passions on both sides. The King advanced, threatening London, but the citizens of the capital turned out valiantly to oppose him, and he "fell back upon Oxford, which henceforward became the centre of their operations. ... War was again the only resource, and speedily became universal. ... There was local fighting over the whole of England. ... The headquarters of the King were constantly at Oxford, from which, as from a centre, Rupert would suddenly make rapid raids, now in one direction, now in another. Between him and London, about Reading, Aylesbury, and Thame, lay what may be spoken of as the main army of Parliament, under the command of Lord-General Essex. ...