"Under the feudal system, it was the duty of every great lord to serve the King in battle, bringing with him so many armed vassals, each of whom in turn brought so many lesser vassals of his own, and so on down the whole scale of hierarchy. Each vassal was bound by oath of allegiance to his own lord and to his own lord only, "while their lives should last"; consequently, if a great lord was killed in battle, his followers were automatically released from their allegiance; they could—and some did—retire from the conflict and take no more part in it. Similarly, if he was taken prisoner or fled from the field, they were left without leader and tended to disintegrate. Hence it was of enormous importance that a lord should lead his men boldly, fight with conspicuous bravery and (if possible) not get killed, or even unhorsed, lest his followers should lose sight of him and become discouraged. This is why Ganelon is so insistent that, if only Roland can be got rid of, the flower of the French army, most of whom are Roland's vassals, will melt away; and this is why, when Marsilion is wounded and flees, the whole Saracen army turns tail. Similarly, when, in the final great battle, the Emperor Charlemagne and the Emir Baligant, lord of all Islam, meet face to face, the whole issue of the war hangs upon their encounter. Baligant falls; and the entire Paynim army at once flees the field."