The Chachnāma (Fatḥnāma-yi Sind) 21: Chach arrives at Brahmanabad, and fights with Akham Lohana.

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Chach then marched against Akham Lohana, who had gone from Brahmanabad into the interior of the country. When he received the intelligence of the arrival of Chach, he came to the capital, and made preparation for war. When Rai Chach arrived at the city of Brahmanabad, Akham stood ready to oppose him. After a great slaughter of warriors on both sides, the army of Akham took to flight, and he entered his fort. Chach laid siege to it, and the siege lasted for the period of one year.
In those days the king of Hindustan, that is, Kanauj, was Satban, son of Rasal, and Akham sent letters to him asking for assistance. But Akham died before the answer was returned, and his son succeeded him. Akham had a friend, an infidel Samani, named Buddh-raku, i.e., "Protected by the idol." He had a temple which was called Budh Nau-vihar, and the idol Duha (?) He was a devotee thereof, and famous for his piety, and all the people of the surrounding places were obedient to him. Akham was his disciple, and he regarded the Samani as his pole-star. When Akham had taken refuge in the fort, the Samani assisted him; he did not fight, but he read his books in his chamber of worship. When Akham died, and his son succeeded him in the government, the Samani was disaffected and troubled, for he did not think it right that the kingdoms and the property and estates should depart from his hands. In his perplexity he looked about, and he arrived at the conclusion that the country must fall to Chach, whether he would be friendly to him or not. Then the (late king's) son being sore pressed, his army and his forces gave up fighting, and the fort was surrendered to Chach, who firmly established his power in it.
When Chach heard of the Samani, and knew that he had made a compact with Akham and his son, and that the war had lasted for one year through his enchantments and magical power, he swore that if he ever captured the fort, he would seize him and flay him, and order drums to be covered with his skin, and have his body torn to pieces. This oath was reported to the Samani, who laughed and said, "Chach will not have the power to kill me." When after a time, the people of the fort, after much fighting and great slaughter, gave up the contest, and solicited protection, by the intervention of nobles and chiefs, a treaty was made between both parties, and the fort was surrendered. Chach entered it, and told them that if they liked they might go away; there was no one to interfere with them, and if they wished to remain they might. The son and the dependants of Akham seeing him kindly disposed towards them, chose to remain. Chach stayed for a time in that city, and made himself acquainted with their disposition.