But there was no time for festivities. The English army was approaching, and it was necessary for Charles to assert his right by hard blows as well as by proclamations. The citizens stood aloof from his standard; but Lord Nairn arrived most opportunely from the Highlands with five hundred of the clan Maclachlan, headed by their chief, and accompanied by a number of men from Athol. These swelled his little army to upwards of two thousand five hundred, and Charles declared that he would immediately lead them against Cope. The chiefs applauded this resolution, and on the morning of the 19th he marched out to Duddingston, where the troops lay upon their arms, and then he summoned a council of war. He proposed to continue the march the next morning, and meet Cope upon the way. In the highest spirits the clans marched on through Musselburgh and over the heights at Carberry, where Mary Queen of Scots made her last unfortunate fight, nor did they stop till they came in sight of the English army.
Cope had landed his force at Dunbar on the very day that the prince entered Edinburgh. His disembarkation was not completed till the 18th. Lord Loudon had joined him at Inverness with two hundred men, and now he met the runaway dragoons, six hundred in number, so that his whole force amounted to two thousand two hundred men--some few hundreds less than the Highlanders. Sir John took the level road towards Edinburgh, marching out of Dunbar on the 19th of September. Next day Lord Loudon, who acted as adjutant-general, rode forward with a reconnoitring party, and soon came back at a smart trot to announce that the rebels were not approaching by the road and the open country to the west, but along the heights to the south. Sir John, therefore, altered his route, and pushed on to Prestonpans, where he formed his army in battle array. He placed his foot in the centre, with a regiment of dragoons and three pieces of artillery on each wing. His right was covered by Colonel Gardiner's park wall and the village of Preston; his left extended towards Seaton House, and in his rear lay the sea, with the villages of Prestonpans and Cockenzie. Between him and the Highlanders was a deep morass.
The night was cold, and the two armies lay on the ground. In the middle of the night Anderson of Whitburgh, a gentleman whose father had been out in the 'Fifteen and who knew the country well, suddenly recollected a way across the bog to the right. He communicated this to Hepburn of Keith and Lord George Murray, who went to waken the prince, who, sitting up in his heap of pea-straw, received the news with exultation. He started up, a council was called, and as it drew towards morning it was resolved to follow Anderson as their guide immediately. An aide-de-camp was despatched to recall Lord Nairn and his five hundred, and the army marched after Anderson in profound silence. It was not without some difficulty that they crossed it, after all; some of the soldiers sank knee-deep, and the prince himself stumbled and fell. When they reached the firm ground the mounted pickets heard the sound of their march, though they could not see them for the thick fog. The dragoon sentinels demanded who went there, fired their pistols, and galloped off to give the alarm.