Which book described the Arab invasion of Sindh for the very first time?

Which book described the Arab invasion of Sindh for the very first time? Correct Answer Chachnama

Chach Nama ‎("Story of the Chach"), also known as the Fateh nama Sindh (Sindhi:‎ "Story of the conquest of Sindh"), and as Tareekh al-Hind wa a's-Sind (Arabic:‎ "History of India and Sindh"), is one of the main historical sources for the history of Sindh in the seventh to eighth centuries CE, written in Persian.

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