'The Helpers' or 'Those who bring victory') are the local inhabitants (mostly Muslims) of Medina who took the Islamic prophet Muhammad and his followers (the Muhajirun) into their homes when they fled from Mecca during the hijra.
[1] The Medinese also even contacted against foreign invaders came from outside Hejaz, including such as Shapur II of Sasanian Empire in relatively vague result,[2] and also in successful defense against Himyarite Kingdom under their sovereign, Tabban Abu Karib,[3][4] who also known as Dhu al-Adh'ar.
[1][6] Thus, in search of enlightenments and seeking arbitration from third party, the Yathribese then pledged their allegiance to Muhammad, a Qurayshi Meccan who preached a new faith, Islam, during the Medinese pilgrimage to Kaaba.
A month after the raid at al-Abwa that Muhammad ordered, he personally led two hundred men including Muhajirs and Ansars to Bawat, a place on the caravan route of the Quraysh merchants.
[9][10] During the tenure of Caliphates after Muhammad, the Ansar mainly became important military elements in many conquests, (as indicated with the appointing of Thabit, bin Qays bin Shammas, an orator of Ansar), to lead Ansaris in support of Khalid ibn al-Walid in the Battle of Buzakha[11] at the time of Caliph Abu Bakr.