Mike kept close to him, until at last the man dismounted to follow the track where the morass was most dangerous. In an instant Mike sprang upon him and buried his dagger in his body. Without a cry the trooper fell. Mike felt in his doublet for Cromwell's letter. Placing this in his breast, he went a few paces from the path where he found that he sunk to his knees, the water being some inches deep over the bog. Then he returned, lifted the body of the trooper, carried it as far into the bog as he dared venture, and then dropped it. He placed his foot on the iron breastpiece, and pressed until the body sank in the soft ooze, and the water completely covered it. Then he went back to the horse, and taking the reins, followed the track until completely clear of the moorland country, where, mounting, he rode back to Kirkglen, and presented himself to Harry. The latter had, hours before, gone to bed, having posted strong guards around the village. He struck a light and listened to Mike's relation of what he had done, and ended by the production of the document with Cromwell's signature. "Another debt to the Earl of Argyll," Harry said grimly. "However, although this proves the treachery of his kinsman, it does not convict Argyll himself, although the evidence is strong enough to hang any other man. Now, Leslie, what do you advise? Shall we send and seize the man left at the hut?" "It is a doubtful question," Leslie answered, after a pause. "When Campbell finds that his messenger does not return before morning, he will like enough send others off to learn the reason why. If they find him gone, Campbell may suspect that his plan has failed and may send warning to Cromwell." "At any rate," Harry continued, "we need not decide before morning. But at daybreak, Leslie, plant a party of men on the road and stop any horseman riding out. Let the sergeant in charge say only that he has my orders that none are to pass eastward. It would be a natural precaution to take, and when the news comes back to the castle, Campbell will not necessarily know that his scheme has been detected." 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."