Debal was the first major town in ______ conquered by the Arabs under ______

"Debal was a strategic coastal town in the Sindh region which played a key role in the Arab expansion into the Indian subcontinent. Located near modern-day Karachi it served as an important trading hub connecting Arabia with South Asia. In 711 AD the Arab forces under the young commander Muhammad Bin Qasim launched a military campaign against the region after incidents involving attacks on Arab ships. Capturing Debal was crucial because it gave the Arabs a foothold in Sindh from where they could advance inland. This victory marked the beginning of Muslim rule in the area influencing the cultural social and economic history of the subcontinent for centuries. The fall of Debal also facilitated the spread of Islam in the region."