A summons was then sent to the principal towns of Andalusia, requiring them to raise fresh levies for the war, who were to be encouraged by promises of better pay than had before been given. But these promises did not weigh so much with the soldiers as the knowledge that Don John of Austria was to take charge of the expedition; and nobles and cavaliers came thronging to the war, with their well-armed retainers, in such numbers that the king felt it necessary to publish another ordinance, prohibiting any, without express permission, from joining the service.[206] All now was bustle and excitement in Granada, as the new levies came in, and the old ones were receiving a better organization. Indeed, Don John had been closely occupied for some time with introducing reforms among the troops quartered in the city, who, from causes already mentioned, had fallen into a state of the most alarming insubordination. A similar spirit had infected the officers, and to such an extent, that it was deemed necessary to suspend no less than thirty-seven out of forty-five captains from their commands.[207] Such were the difficulties under which the youthful hero was to enter on his first campaign. Fortunately, in the retainers of the great lords and cavaliers, he had a body of well-appointed and well-disciplined troops, who were actuated by higher motives than the mere love of plunder.[208] His labours, moreover, did much to restore the ancient discipline of the regiments quartered in Granada. But the zeal with which he had devoted himself to the work of reform had impaired his health. This drew forth a kind remonstrance from Philip, who wrote to his brother not thus to overtask his strength, but to remember that he had need of his services; telling him to remind Quixada that he must watch over him more carefully. "And God grant," he concluded, "that your health may be soon re-established." The affectionate solicitude constantly shown for his brother's welfare in the king's letters, was hardly to have been expected in one of so phlegmatic a temperament, and who was usually so little demonstrative in the expression of his feelings. Before entering on his great expedition, Don John resolved to secure the safety of Granada, in his absence, by the reduction of "the robber's nest," as the Spaniards called it, of Guejar. This was a fortified place, near the confines of the Alpujarras, held by a warlike garrison, that frequently sallied out over the neighbouring country, sometimes carrying their forays into the _vega_ of Granada, and causing a panic in the capital. Don John formed his force into two divisions, one of which he gave to the duke of Sesa, while the other he proposed to lead in person. They were to proceed by different routes, and, meeting before the place, to attack it simultaneously from opposite quarters. [Sidenote: CAPTURE OF GUEJAR.]