Edited sentence: In 674, the Islamic invasions reached present-day Afghanistan.In that period, there was an independent kingdom in Kabulistan called Kabulshahan.The Islamic troops met the most strict defense in Kabulistan than any other area near by.They built a defensive wall all around the Kabul city for the protection against eventual Arab attacks.Today, this surrounding wall of Kabul is considered as an old historical monument, but has been mostly destroyed