"When the help of God and the Victory arrive,
And thou seest men entering the religion of God by troops,
Then utter the praise of thy Lord, implore His pardon, for He
loveth to turn in mercy."—The Kuran.

After the swordless triumph of Dzul Cada, 629, Mahomet rested in Medina for about nine months, while he sent out his leaders of expeditions into all parts of the peninsula wherever a rising was threatened, or where he saw the prospect of a conversion by force of arms. The Beni Suleim, whose more powerful allies, the Ghatafan, had given Mahomet much trouble in the past, were still recusant. Mahomet sent an expedition to essay their conversion early in the year, but the Suleim persisted in their enmity and received the Muslim envoys with a shower of arrows. They retired hastily, being insufficiently equipped to risk an attack, and came back to Medina. The Prophet, unabashed, now sent a detachment against the Beni Leith. The encampment was surprised, their camels plundered, their chattels seized, while they themselves were forced to flee in haste to the fastnesses of the desert. The Beni Murra, conquerors of Mahomet's expeditionary force at Fadak, received now at his hands their delayed but inevitable punishment. The Prophet found himself strong enough, and without any compunction he inflicted the severest chastisement upon them, more especially as an example to the neighbouring tribes of the retribution in store for all who dared to revolt against his newly-won but still precarious power.

Soon after an expedition of fifteen men was sent to Dzat Allah upon the borders of Syria. The men journeyed confidently to their far-off goal, but instead of finding, as they expected, a few chiefs at the head of ill-organised armies, they found arrayed against them an overwhelming force, well led and disciplined. They called upon them to embrace Islam with the fine courage of certain failure. The Bedouin hordes scoffed at the exhortation, and forthwith slew the whole company except one, who managed to escape to Medina with the tale. The catastrophe was a signal for a massed attack upon Mahomet's power from the whole of the border district, led by the feudatories of Heraclius, who were bent upon exterminating the upstart.

Hastily the Muslim army was mobilised, given into the leadership of Zeid, who with Jafar and Abdallah was commissioned to resist the infidels to the last and to continue their attack upon the foe until they were either slain or victorious. The army marched to Muta in September, 629, and while on the way heard with alarm of the massing of the foe, whose numbers daunted even their savage bravery.

At Muta a council of war was called at which Zeid and Abdallah were the principal speakers. After the peril of their position had been discussed and the reasons for retreat given, Abdallah rose from among his fellows, determined to rally their spirits. He pressed for an immediate advance, urging the invincibility of Allah, the power of their Prophet, and the glory of their cause. It was impossible for those warrior spirits not to respond to his enthusiasm, and the order was given. The Muslim marched to Beleea by the Dead Sea, but finding themselves in no good strategic position and hearing still further news as to the immensity of their opposition, they retired to Muta, where at the head of a narrow ravine they offered battle to the Roman auxiliaries, who far outweighed them in numbers and efficiency.

The Roman phalanx bore down upon them, and Zeid at the head of his troops urged them to resist with all their strength. He was cut down in the van as he led the opposing rush, and instantly Jafar, leaping from his horse, maimed it, as a symbol that he would fight to the death, and rushed forward on foot. The fight grew furious, and as the Muslim army saw itself slowly pressed back by the enemy its leader fell, covered with wounds. Abdallah seized the standard and tried to rally the Faithful, whose slow retreat was now breaking into a headlong flight. At his cry there was a brief rally, until in his turn he was cut down by the advancing foe. A citizen sprang to the standard and kept it aloft while he strove to stem the tide, but in vain. The Muslim ranks were broken and dispirited. They fell back quickly, and only the military genius of Khalid, in command of the rear, was able to save them from annihilation. He succeeded in covering their retreat by his swift and skilful moving, and enabled the remnant to return to Medina in safety.

Mahomet's grief at the loss of Jafar and Zeid was great. Jafar had only lately returned from Abyssinia, and was just at the beginning of his military career. He was the brother of Ali, and the martial spirit that had raised that warrior to eminence was only just now given opportunity to manifest itself. His loss was rightly felt by Mahomet to be a blow to the military as well as the intellectual prowess of Islam.

The Syrian feudatories, however, were not permitted to enjoy their triumph in peace. In October, 629, Amru, Mahomet's recent convert, was sent to chastise the offenders and exact tribute from them. He found the task was greater than he had imagined, and sent hurriedly to Medina for reinforcements. Abu Obeida was in command of the new army, and when he came up with Amru there was an angry discussion as to who should be leader. Abu Obeida had the precedent of experience and the asset of having been longer in Mahomet's service than Amru, but he was a mild man, fearful, and a laggard in dispute. Amru's impetuous determination overruled him, and he yielded to the compulsion of his more energetic rival, fearing to provoke disaster by prolonging the quarrel. The hostile Syrian tribes were rapidly dispersed with the increased forces at Amru's command, and he returned triumphant to Medina.

As a recompense for his yielding of the leadership to Amru, Abu Obeida was entrusted by Mahomet with the task of reducing the tribe of Joheina to submission. The expedition was wholly successful; the Joheina accepted the Prophet's yoke without opposition, and their lead was followed later in the year by the Beni Abs Murra and the Beni Dzobian, and finally the Beni Suleim, whose enmity in conjunction with the Beni Ghatafan had done much to prolong the siege of Medina.

The Prophet was exultant. The year's successes had surpassed his expectations, and the maturing of his deep-laid plans for the reduction of Mecca by pressure without bloodshed satisfied his ambitious and dominating soul. He was now master of Hedaz, overlord of Yemen and the Bedouin tribes of the interior as far as the dim Syrian border.