The Scottish force comprehended a nominal total of twenty-six thousand men, of which eighteen thousand were foot and eight thousand horse. It was under the command, in deed if not in name, of David Leslie, the same excellent officer who had routed the brilliant Montrose at Philiphaugh and had handled his cavalry so efficiently at Marston Moor. His troops however were inferior in quality to the English. It is true that in 1647 the Scotch had followed the example of England in remodelling their army, but the total strength of this force was but five thousand foot and fifteen hundred horse; and this, even supposing the whole of it to have been efficient, was but a small leaven among twenty-six thousand men. Leslie therefore stood carefully on the defensive and resisted all Cromwell's temptations to a pitched battle. After a couple of days Cromwell was compelled to fall back to Musselburgh for supplies. He then determined to march round Edinburgh and push on to Queensferry, where he could regain touch with his fleet on the northern side of the town. Political reasons, however, induced him to linger in the execution of this project; and the delay enabled Leslie to take up a position which rendered it impossible. Unable to force Leslie to an engagement, and not daring to attack him with inferior numbers, Cromwell found himself completely outmanœuvred. Dysentery broke out in the English troops; supplies began to fail; and he was compelled to fall back by Haddington and Musselburgh to his ships at Dunbar. There he arrived on the 1st of September with "a poor, shattered, hungry, discouraged army." The Scots had pressed the pursuit very closely, the rearguard had been constantly engaged, and, most significant of all, the English discipline even under Oliver himself had begun to fail.[179] Having driven his enemy into the peninsula of Dunbar, Leslie sent forward a force to bar a defile on the road to Berwick at Cockburnspath, and cut off his retreat. The situation of the English was desperate, and Cromwell was at his wits' end. His army was reduced by sickness to eleven thousand men, while the Scots still numbered twenty-three thousand; he could expect no relief from Berwick; and Leslie lay in a strong position, from which it was hopeless to attempt to dislodge him, between him and the Tweed. [Sidenote: Sept. 2.]