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معركة ذات السلاسل
The Battle of Dhat al-Salasil, known in Arabic as Ghazwat Dhat al-Salasil (ذات السلاسل), was the first major engagement of the Muslim conquest of Iraq. Fought in 12 AH (633 CE) near the port city of Ubulla in southern Mesopotamia, this battle marked the beginning of the end for Sassanid Persian dominion over the region and announced the arrival of Islam's armies on the world stage.
Following the successful suppression of the Ridda Wars, Caliph Abu Bakr al-Siddiq turned his attention to the two great empires bordering the Arabian Peninsula. The Sassanid Empire, though still formidable, had been severely weakened by decades of exhausting warfare against the Byzantine Empire. Internal instability, rapid succession of rulers, and economic strain had left Persia vulnerable.
Abu Bakr dispatched Khalid ibn al-Walid, the commander who had proven himself decisively during the Ridda Wars, to lead the Muslim forces into Iraq. Khalid was given command of a force drawn from several tribes, and he marched northward toward the fertile lands of the Sawad, the agricultural heartland of the Sassanid frontier.
The Sassanid court, alerted to the Muslim advance, dispatched its frontier governor Hurmuz ibn Hurmuz to intercept the invading force. Hurmuz was a seasoned military commander who held authority over the border regions and was known for his harsh treatment of the Arab tribes living under Persian suzerainty. He assembled a substantial army at Kazima, near the strategic port of Ubulla on the Persian Gulf.
The battle derives its distinctive name from the Persian tactical decision to chain their frontline soldiers together. This measure, described by al-Tabari and other historians, was intended to prevent any soldier from fleeing the battlefield. The chains bound groups of warriors to one another, a symbol of their resolve to hold the line against the Muslim advance. What the Persians intended as a display of determination would become their undoing.
Khalid ibn al-Walid advanced his forces and confronted the Persian army at Kazima. Before the general engagement began, Hurmuz challenged Khalid to single combat, a common practice in the warfare of the era. The two commanders met between the lines, and Khalid slew Hurmuz in personal combat. According to the accounts preserved by Ibn Kathir in al-Bidayah wa al-Nihayah, this duel shattered Persian morale before the main battle had even commenced.
With their commander dead, the Persian forces were thrown into disarray. The Muslim cavalry pressed their advantage, striking at the flanks of the chained formations. The very chains that were meant to steel the Persian resolve now became a death trap. Soldiers who fell pulled their bound companions down with them. Those who wished to retreat found themselves shackled to the dead and dying. The formation collapsed, and what began as an orderly defense became a rout.
The Muslim forces pursued the retreating Persians and seized control of Ubulla, a vital port on the Persian Gulf and a key node in Mesopotamian trade. The spoils of war were considerable, including the ornate chain armour and equipment of the Persian heavy infantry.
Khalid dispatched the khums (one-fifth share of the spoils mandated by the Quran) to Caliph Abu Bakr in Madinah. The Persian chain armour was displayed publicly, serving as tangible proof of the victory and bolstering confidence among the Muslim community. Abu Bakr reportedly praised Allah for the victory and supplicated for the continued success of the Muslim forces.
The Battle of Dhat al-Salasil carried significance far beyond its immediate military outcome. It demonstrated that the Sassanid Empire, long regarded as one of the two great powers of the known world, could be defeated in open battle. This shattered the aura of invincibility that had surrounded Persian arms for centuries.
Strategically, the capture of Ubulla gave the Muslims control over a major commercial port and opened the door to southern Iraq. Khalid would follow this victory with a rapid series of engagements, including the battles of al-Mazar, Walaja, and Ullais, each driving deeper into Persian territory and dismantling Sassanid control over Mesopotamia.
The Battle of Dhat al-Salasil stands as a testament to the military genius of Khalid ibn al-Walid, whom the Prophet Muhammad ﷺ had called Sayf Allah al-Maslul (the Drawn Sword of Allah). It also reflects the broader pattern of early Islamic expansion, in which relatively small but highly motivated Muslim forces overcame numerically superior opponents weakened by internal division and prolonged conflict.
For the Sassanid Empire, this battle was the first tremor of the earthquake that would bring down their six-century-old civilization within a decade. For the Muslims, it was the opening chapter of a campaign that would bring the message of Islam to millions of people across Mesopotamia and Persia, transforming the religious and cultural landscape of the region permanently.