When Satan had again induced Firûz to break the treaty of peace with Khoshnavâz, he called Soukher, the Governor of Sejestân, who was a descendant of Minucheher, and giving the administration of the kingdom, together with his two sons, Bellâsh and Qobâd, into his charge, he determined to invade Hayatalah. When his Mobeds and well-wishers threatened him with the consequences entailed by the transgression of covenants, he always replied: ‘I do not want to hear anything.’ Accordingly, he marched against the King of Hayatalah, who in his turn advanced towards him, and dug in the rear of his army a broad and deep fosse, which he covered on the top with light twigs, and then got ready for an encounter. When the armies met, Khoshnavâz bore the document of the treaty of peace on a spear, reading a portion of it to Firûz, but without producing any effect. A short while afterwards champions stepped forth on both sides with their steeds, and the contest began. Khoshnavâz then retreated along a road which he had left near the above-mentioned fosse, but Firûz, pursuing his enemy hotly, was precipitated into it with the majority of his courtiers and attendants. Then Khoshnavâz returned slaughtering and plundering; he also captured the daughter of Firûz, who was one of the most intelligent women of those times:
‘What a wise king to keep away his sons from the war, but to bring his daughters to witness it!’
When the news of this great calamity had reached Soukher, who was the Governor of Erân on the part of Firûz, he collected a large army and marched to Hayatalah, where finally peace was concluded between Soukher and Khoshnavâz, on condition that the latter restored the prisoners and the goods he had taken. This having been done, Soukher returned contented to Persia, where he installed on the throne Bellâsh Bin Firûz, whose brother Qobâd had fled, and had taken refuge with the King of Turkestân. According to one statement, the reign of Firûz lasted twenty-six, and according to another twenty-one, years, and his sobriquet was ‘the valiant.’