And with this defiance the boy chieftain and "the young champions of the tribe of Cas" went deeper into the woods and fastnesses of the County Clare, and for months kept up a fierce guerilla warfare. The Danish tyrants knew neither peace nor rest from his swift and sudden attacks. Much booty of "satins and silken cloths, both scarlet and green, pleasing jewels and saddles beautiful and foreign" did they lose to this active young chieftain, and much tribute of cows and hogs and other possessions did he force from them. So dauntless an outlaw did he become that his name struck terror from Galway Bay to the banks of Shannon, and from Lough Derg to the Burren of Clare. "When he inflicted not evil on the foreigners in the day," the quaint old record asserts, "he was sure to do it in the next night, and when he did it not in the night he was sure to do it in the following day." To many an adventurous boy the free outlaw life of this daring lad of nine centuries ago may seem alluring. But "life in the greenwood" had little romance for such old-time outlaws as Brian Boru and Robin Hood and their imitators. To them it was stern reality, and meant constant struggle and vigilance. They were outcasts and Ishmaels--"their hands against every man and every man's hand against them,"--and though the pleasant summer weather brought many sunshiny days and starlit nights, the cold, damp, and dismal days took all the poetry out of this roving life, and sodden forests and relentless foes brought dreary and disheartening hours. Trust me, boys, this so-called "free and jolly life of the bold outlaw," which so many story-papers picture, whether it be with Brian Boru in distant Ireland, nine hundred years ago, or in Sherwood Forest with Robin Hood, or with some "Buckeye Jim" on our own Montana hill-sides to-day, is not "what it is cracked up to be." Its attractiveness is found solely in those untruthful tales that give you only the little that seems to be sweet, but say nothing of the much that is so very, very harsh and bitter. Month by month the boy chieftain strove against fearful odds, day by day he saw his brave band grow less and less, dying under the unpitying swords of the Danes and the hardships of this wandering life, until of all the high-spirited and valiant comrades that had followed him into the hills of Clare only fifteen remained. One chill April day, as Brian sat alone before the gloomy cave that had given him a winter shelter in the depths of the forests of Clare, his quick ear, well trained in wood-craft, caught the sound of a light step in the thicket. Snatching his ever-ready spear, he stood on guard and demanded: "Who is there?" No answer followed his summons. But as he waited and listened, he heard the notes of a song, low and gentle, as if for his ear alone: