Say made a disastrous miscalculation in thus evacuating Oxford. For within a few weeks it was destined to become and to remain the headquarters of the King. Many Royalists who had been wounded at Edgehill were brought into Oxford. On 29th October the King, with the Duke of York, Prince Charles and Rupert, rode in with the army at the North Gate. The colours taken from the enemy were carried in triumph; the King was received by the mayor with a present of money at Pennilesse Bench, and the heavy ordnance, twenty-seven pieces in all, were driven into Magdalen College Grove. The princes and many of the court took their degrees. Charles stayed but a short while, for, after having recruited his army and having been presented by the colleges with all the money they had in their treasuries, he presently left the city to make an advance on London. For Reading had surrendered to the Royalists, and Rupert's daring capture of Brentford now threatened the capital. But the junction of the train-bands of London with the army of Essex forced Charles to fall back on his old quarters at Oxford. There the fortification of the town was giving him a firm hold on the Midland counties. A plan of fortifications had been prepared by one Rallingson, a B.A. of Queen's College. A series of earthworks, with sharp angles flanking each other, was to be thrown up outside the town. On 5th December 1642 the University bellman had gone about the city warning all privileged persons that were householders to send some of their families next day to dig at the works. The citizens, however, who were set to work north of S. Giles', were not enthusiastic. The King found only twelve of them working where there should have been one hundred and twenty-two, "of which neglect his majesty took notice and told them in the field." The trench and rampart thus begun by the privileged men and workmen paid by the colleges, ran from the Cherwell at Holywell Mill, passing by Wadham and S. John's gardens and S. Giles' Church up to the branch of the Thames at Walton Bridge. Next, similar earthworks were made to cover S. Clement's, the east suburb. As time was pressing, and the city and county were not eager workers, the King called upon the University to help in February. The members of the various colleges were set to work on the line which ran from Folly Bridge across Christ Church meadow in front of Merton. (The bastion traceable in Merton Gardens dates from this time.) In the following June every person resident in a college or hall between sixteen and sixty was required to give a day's work a week with pick and spade, or to pay for a substitute, if unable or unwilling to anticipate the labours of Mr Ruskin. Finally (January 1644), the colleges were commanded to raise the sum of forty pounds a week for twenty weeks to complete the works.