Of siege implements, beyond the torch and the scaling-ladder, they seem to have had no knowledge, and to have desired none. The Dano-Irish alone were accustomed to fortify and defend their towns, on the general principles, which then composed the sum of what was known in Christendom of military engineering. Quick to acquire in almost every department of the art, the native Irish continued till the last obstinately insensible to the absolute necessity of learning how modern fortifications are constructed, defended, and captured; a national infatuation, of which we find melancholy evidence in every recurring native insurrection. The two divisions of the Irish infantry were the _galloglass_, or heavily armed foot soldier, called _gall_, either as a mercenary, or from having been equipped after the Norman method, and the _kerne_, or light infantry. The horsemen were men of the free tribes, who followed their chief on terms almost of equality, and who, except his immediate retainers, equipped and foraged for themselves. The highest unit of this force was a _Cath_, or battalion of 3,000 men; but the subdivision of command and the laws which established and maintained discipline have yet to be recovered and explained. The old Spanish "right of insurrection" seems to have been recognized in every chief of a free tribe, and no Hidalgo of old Spain, for real or fancied slight, was ever more ready to turn his horse's head homeward than were those refractory lords, with whom Roderick O'Conor and his successors, in the front of the national battle, had to contend or to co-operate. CHAPTER III. THE FIRST CAMPAIGN OF EARL RICHARD—SIEGE OF DUBLIN—DEATH OF KING DERMID McMURROGH. The campaigns of 1168 and 1169 had ended prosperously for Dermid in the treaty of Ferns. By that treaty he had bound himself to bring no more Normans into the country, and to send those already in his service back to their homes. But in the course of the same autumn or winter, in which this agreement was solemnly entered into, he welcomed the arrival at Wexford—of Maurice Fitzgerald—son of the fair Nesta by her first husband—and immediately employed this fresh force, consisting of 10 knights, 30 esquires, and 100 footmen, upon a hosting which harried the open country about Dublin, and induced the alarmed inhabitants to send hostages into his camp, bearing proffers of allegiance and amity. As yet he did not feel in force sufficient to attack the city, for, if he had been, his long cherished vengeance against its inhabitants would not have been postponed till another season.