Their great advantages in the north seemed to second their ambition, and finally to promise them success in their unwarrantable enterprises. Manchester, having taken Lincoln, had united his army to that of Leven and Fairfax; and York was now closely besieged by their combined forces. That town, though vigorously defended by Newcastle, was reduced to extremity; and the parliamentary generals, after enduring great losses and fatigues, flattered themselves that all their labors would at last be crowned by this important conquest. On a sudden, they were alarmed by the approach of Prince Rupert. This gallant commander, having vigorously exerted himself in Lancashire and Cheshire, had collected a considerable army; and joining Sir Charles Lucas, who commanded Newcastle's horse, hastened to the relief of York with an army of twenty thousand men. The Scottish and parliamentary generals raised the siege, and drawing up on Marston Moor, purposed to give battle to the royalists. Prince Rupert approached the town by another quarter, and, interposing the River Ouse between him and the enemy, safely joined his forces to those of Newcastle. The marquis endeavored to persuade him, that, having so successfully effected his purpose, he ought to be content with the present advantages, and leave the enemy, now much diminished by their losses, and discouraged by their ill success, to dissolve by those mutual dissensions which had begun to take place among them.[*] The prince, whose martial disposition was not sufficiently tempered with prudence, nor softened by complaisance, pretending positive orders from the king, without deigning to consult with Newcastle, whose merits and services deserved better treatment, immediately issued orders for battle, and led out the army to Marston Moor.[**] This action was obstinately disputed between the most numerous armies that were engaged during the course of these wars; nor were the forces on each side much different in number. Fifty thousand British troops were led to mutual slaughter; and the victory seemed long undecided between them. Prince Rupert, who commanded the right wing of the royalists, was opposed to Cromwell,[***] who conducted the choice troops of the parliament, inured to danger under that determined leader, animated by zeal, and confirmed by the most rigid discipline. * Life of the Duke of Newcastle, p. 40. ** Clarendon, vol. v. p. 506. *** Rush, part iii. vol. ii. p. 633.