The next morning Leslie volunteered to go out with a couple of men and capture the guide, and arraying himself in his clothes, to take his place, and lead the Roundhead troops astray.

"Were the country other than it is," Harry said, "I would accept your offer, my brave Leslie, even though it might entail your death, for it would be difficult for you to slip away. But over such ground there is no need of this. Let the guide lead the Roundhead troops along the path. We will reconnoiter the morass to-day, and when night falls will so post our men as to open a fire on either flank of him as he comes across the track. Not more than four footmen can march abreast, according to what Mike says, and we shall surprise him, instead of he surprising us."

An hour later two horsemen rode out from the castle, but upon reaching the guard Leslie had placed were turned back. They returned to the castle, and a short time afterward a trooper rode down into the village with a note from Alan Campbell, demanding haughtily by what warrant Colonel Furness ventured to interfere with the free passage of his retainers. Harry replied that he had, as a military precaution, stationed guards on the various roads leading toward the enemy's quarter, and that they were ordered to turn back all, whomsoever they might be, who might seek to pass.

Alan Campbell returned a furious answer, that he should sally out with his garrison, and ride where he listed. Harry replied by marching fifty men up to the road leading to the castle, and by sending a message to Alan Campbell that, although he should regret to be obliged to treat him as an enemy, yet that assuredly if he strove by force to break the military rules he had laid down, he should be compelled to fire upon him. Leaving the detachment under charge of Lieutenant Long, and the main body in the village under that of Hugh Grahame, Harry, accompanied by Donald Leslie and Mike, rode off to reconnoiter the morass. They found that it was particularly bad at two points, while between these the ground was firm for a distance of twenty yards on each side of the track. Beyond the swamp was very deep for thirty or forty yards on both sides, and then it was again somewhat firmer.

Harry decided to post twenty-five men behind these quagmires. Their orders would be to remain perfectly quiet until the column, passing the first morass, should have entered the second; then, when Harry, with the main body, opened fire upon them there, they were to commence upon the flanks of the column.

Returning to the camp, Harry sent forty men with shovels, obtained in the village, to dig a trench, twelve feet wide, and as deep as they could get for the water, across the track, at the near side of the morass.

At nightfall, leaving twenty-five men under William Long in front of the castle, with orders to let none issue forth, and to shoot down any who might make the attempt, Harry marched out with the rest of his command. Crossing the ditch which had been dug, he led fifty forward, and posted them, as he had planned with Leslie; with twenty-five, he took up his own station behind the breastwork formed by the earth thrown out from the trench. The remaining fifty he bade advance as far as they safely could into the swamp on either side. Two hours later a dull sound was heard, the occasional clink of arms, and the muffled tread of many feet on the soft ground. The Roundhead infantry, two hundred strong, led the way, followed by their horse, the guide walking with the officer at the head of the column. When it approached within twenty yards of the ditch Harry gave the word, and a flash of fire streamed from the top of the earthwork. At the same moment those on either side opened fire into the flanks of the column, while the fifty men beyond poured their fire into the cavalry in the rear of the column.

For a moment all was confusion. The Roundheads had anticipated no attack, and were taken wholly by surprise. The guide had fallen at the first discharge and all were ignorant of the ground on which they found themselves. They were, however, trained to conflict. Those on the flank of the column endeavored to penetrate the morass, but they immediately sank to the middle, and had much ado to regain the solid track. The head of the column, pouring a volley into their invisible foes, leveled their pikes, and rushed to the assault. A few steps, and they fell into a deep hole, breast high with water, and on whose slippery bottom their feet could scarce find standing. In vain they struggled forward. From front and flank the fire of their enemy smote them. Those who reached the opposite side of the trench were run through with pikes as they strove to climb from it.

For ten minutes the desperate struggle continued, and then, finding the impossibility of storming such a position in the face of foes of whose strength they were ignorant, the Roundhead infantry turned, and in good order marched back, leaving half their number dead behind them. The cavalry in the rear had fared but little better. Finding the ground on either side was firm when the fire opened on their flanks, they faced both ways, and charged. But ere the horses had gone twenty strides they were struggling to their girths in the morass. Their foes kept up a steady fire, at forty yards' distance, into the struggling mass, and before they could extricate themselves and regain the pathway, many leaving their horses behind, a third of their number had fallen. Joined by the beaten infantry, they retired across the track, and made their way back toward their camp.

Leaving a strong guard at the morass to resist further attempts, Harry returned with his force to the village having inflicted a loss of a hundred and fifty upon enemy, while he himself had lost but eight men. He intrenched the position strongly, and remained there unmolested, until a week later he received orders to march back to Edinburgh. The following day he was summoned before King Charles. He found there General Leslie, the Earl of Argyll, Alan Campbell, and several of the leaders of the Covenant.