The Lords of the Marches were not now ordered to contribute any troops, but were to hold their castles strongly; lest, when the army was fairly entangled among the mountains, Glendower should make a great incursion into England. The only advantage gained by the English invasion was that the king, by promises of pardon and rewards, drew away a number of the leading men who had hitherto acted with Glendower. Their defection, however, was more than made up by the enthusiasm excited by the spectacle of the second retirement of a great English army, without having effected anything of importance. So evident was this, that in October Henry again advanced, with the contingents of no fewer than twenty-two counties. The season, however, was already unfavourable for operations and, after enduring great hardships and suffering, the army again fell back, having effected even less than the two which had preceded it. Things, however, turned out fortunately for Oswald. The army had advanced a week across the border when a messenger arrived at Ludlow, with a letter from London for the king. "It will be no easy matter to forward it," Sir Edmund said, as the despatch was handed to him. "Indeed, I see not how it is to be done. Beyond the fact that the king intended to march west, I know nothing whatever of his intentions, or of the exact road he was likely to take. His orders were strict, that we were to keep our forces well in hand; and to send the letter forward would need two hundred men, at least, as an escort. It places me in an awkward position, indeed." "If it so please you, Sir Edmund," said Oswald, who was one of the group standing round, when the messenger handed the letter to Mortimer; "I will endeavour to carry the despatch for you. Methinks that, while fifty men would not succeed in getting through to the army, two might, perchance, manage to do so. I shall, of course, ride first to Shrewsbury, through which the king passed; and so follow up the course he took. There should be no great difficulty in doing that, for the march of so great a body of men must have left many traces behind. They will, doubtless, have harried the country, for some distance each side of the line they followed; and it is not likely that I should meet any of the Welsh, until I was near the army. Then, of course, great caution would have to be used; for it is like enough that there are parties of Glendower's men hanging on its skirts, to cut off stragglers, and plunder any waggons whose horses may have fallen by the way."