some Muslim leaders and citizens resisted going under the command of Usama because they thought that he, who was 20 at the time, was too young to lead an army. Muhammad dismissed these concerns. This incident is also mentioned in the Sahih al-Bukhari. Certain companions of the prophet tried to persuade Abu Bakr, who succeeded Muhammad as leader of the Islamic community, to replace Usama as commander of the army with Umar Ibn Al-Khattab, due to Usama's youth. Abu Bakr was under great pressure regarding this expedition due to rising rebellion and apostasy across Arabia, but he was determined. reaffirmed the decision of Muhammad and dispatched the expedition under Usama's leadership. Expedition According to Al-Tabari, before Usama headed out and raided the inhabitants of Syria, Abu Bakr commanded Usama to follow ten rules of war. The tradition of the ten rules of Abu Bakr is also mentioned in the Sunni Hadith collection of Al-Muwatta.: Tabari states that the expedition was successful, and Usama reached Syria and became the first Muslim force to successfully raid Byzantine territory, thus paving the way for the subsequent Muslim conquests of Syria and Egypt from the Byzantine Empire. This expedition became notable in Islam history due to how the still eighteen year old Usama was appointed as overall commander, leading veterans and high ranked companions of the prophet such as Umar, Sa'd ibn Abi Waqqas, Sa'id ibn Zayd, Abu Ubayda ibn al-Jarrah, and Qatada ibn al-Nu'man. See also List of expeditions of Muhammad Muslim conquest of the Levant Ridda Wars Ghazwa Islamic military jurisprudence Zayd ibn Haritha References Notes Sources Bibliography . Note: This is the free version available on Google Books Invasions 630s conflicts 632 Heraclius