As for Ibn Isḥāq, he dated it to the year twenty.

In that same year the battle of Suhāb took place in the land of Persia, during Dhū al-Ḥijjah; the Muslims were led by al-Ḥakam ibn Abī al-ʿĀṣ, who killed Sahark, the vanguard commander of the polytheists.

Khalīfah records that during this year the Byzantines captured ʿAbd Allāh ibn Ḥudhāfah al-Sahmī. Some say that Tikrīt was also opened in this year, and it is likewise said that the battle of Jalūlāʾ—another engagement fought in the Persian territories—occurred then.

In the same year ʿUmar dispatched ʿUthmān ibn Abī al-ʿĀṣ to Fourth Armenia; a skirmish took place there in which Ṣafwān ibn al-Muʿaṭṭil ibn Raḥḍah al-Sulamī al-Dhakwānī was killed.

According to one report mentioned earlier, this year also witnessed the death of Yazīd ibn Abī Sufyān.

Year Twenty (20 AH): The Conquest of Egypt

In this year Egypt was conquered. Khalīfah—citing several authorities—and others relate that during it ʿUmar wrote to