 However, Muhammad considered the treaty broken.Abu Sufyan, the leader of the Quraish in Mecca, was aware that the balances were now tilted in Muhammad's favour, went to Medina to restore the treaty but Muhammad refused to accommodate him and Abu Sufyan returned to Mecca empty-handed.When he learned that a Muslim army of 10,000 soldiers was marching towards Mecca, he converted to Islam and negotiated Mecca's transfer of power to avoid a conquest.