Christianity no longer had the ability to stand against the Islamic tide that began to flow from Egypt through Nubia. It seems this door began to open wide for the Islamic tide to flow freely without any restrictions, after the Muslims had known the land of Nubia, or Makuria, in the north, and the land of Alwa in the south, or (Hakam al-Abwab), the first province of the kingdom of Alwa. The campaign of Abdullah bin Saad Abi Sarh had penetrated Nubia as far as the capital, Dongola, and besieged it fiercely, striking their fortresses with catapults that the Nubians had not known before. Then their king, "Qalyun," requested peace, after the Muslims dictated their terms. Then the Islamic advance stopped at this point, and the Muslims were convinced of reconciliation. They stipulated safety for themselves and that the Nubians would not fight them, and that the Nubians would allow Muslims to pass through their lands without settling there, and that the Nubians would be responsible for the safety of any Muslims who stayed in their lands. This means that Islam had infiltrated Sudan since the Islamic conquest of Egypt, as well as many other clauses and conditions, including that the Nubians would maintain the mosque built by the Muslims in Dongola, keep it clean, lit, and honored. This provides strong evidence that Islam had infiltrated throughout the ten years from 21 AH / 641 AD to 31 AH / 652 AD, as well as protecting traders and other Muslims who passed through their lands. . . . . . . . . . . . . . . . . . . . . . . . . Similarly, the Nubians, in turn, were no less eager for an agreement than the Arabs. Their mother church in Egypt was in the hands of the Muslims, as were the trade routes and paths. Therefore, all these mutual desires crystallized in the treaty of Al-Baqt. As the Nubians pledged to preserve the mosque built by the Muslims in Dongola and not to demolish it. This treaty was like laying the foundations for the building of the Arab-Islamic society in Nubia, because it obliged the Nubians to open their lands to every incoming Muslim, provided they did not settle. This was a signal for the launch of the Islamic call to their religion, as they built their passage through Nubia, moving south towards the kingdom of Alwa. 313