Al-Nawshari's son was killed, but Isa was defeated and fled to Egypt with what wealth he could gather, while al-Nawshari occupied the capital of Palestine, Ramla.[2][4] In Egypt, Isa finally conceded the oath of loyalty (bay'ah) to al-Mu'tazz, while al-Nawshari in his turn fell out with the Caliph, who had not sanctioned his seizure of Ramla and dispatched an army under Muhammad ibn al-Muwallad to drive him out. Isa then returned to Palestine, bringing with him money, supplies, and possibly troops recruited in Egypt, and built a fortress called al-Husami, situated between Ramla and Ludd. From this base, he managed to withstand the repeated attacks of Ibn al-Muwallad, until—probably after a truce was agreed—both returned to the caliphal capital, Samarra.[4][5]