Expedition of 'Eeas
Even after the migration to Medina, the mischief of the disbelievers did not come to an end. Their misconduct towards the Muslims did not cease to exist. For this reason, the Muslims had to remain alert and be vigilant of the movement of the disbelievers.
In a narration we find that in order to remain vigilant of the movement and mischief of the Quraish, the Holy Prophet (sa) was in need of [appointing and sending] expeditions, in which Hazrat Hamza (ra) was enabled to serve in an extraordinary manner. In Rabi’-ul-Awwal [Islamic month], in the second year after the migration, the Holy Prophet (sa) sent an expedition of thirty Muhajireen [migrants to Medina] riding on camels, in the leadership of Hazrat Hamza (ra) towards ‘Eeas.
Hazrat Hamza (ra) and his companions swiftly reached this place, upon which they saw that the leading chief of Mecca, Abu Jahl, was present in order to welcome them with an army of three hundred men riding on horses and camels. This was ten times the size of the Muslim expedition. However, the Muslims had left their homes in compliance with the command of Allah and His Messenger (sa) and the fear of death could not hold them back. Both [armies] stood face to face to one another and they lined up in rows. They were on the brink of engaging in battle when the chief of that area, Majdi bin ‘Amr Al-Juhni, who had a relationship with both parties, intervened and stopped the fight just as it was about to erupt.
(Sirat Khatam-un-Nabiyyeen, Hazrat Mirza Bashir Ahmad Sahib M.A., p. 329)