How a legendary Muslim commander conquered the Sassanid capital by crossing a flooded river
In short: Sa'd ibn Abi Waqqas was a pivotal figure in the early Islamic conquests, known for his archery and leadership. After securing a monumental victory at al-Qadisiyyah, he led his army across the turbulent Tigris River on horseback to capture the Sassanid capital, Ctesiphon, leaving the defenders in total disbelief.
Sa'd ibn Abi Waqqas, an early convert to Islam and a companion of Muhammad, rose to prominence as a supreme commander of the Rashidun army. His military career was defined by his role in the conquest of Persia, most notably the Battle of al-Qadisiyyah in 636 or 637. While historical accounts of the battle are often embellished with tribal legends, it remains a cornerstone of Islamic history. Sa'd, reportedly unable to lead from the front due to illness, directed operations from a tent, overseeing a four-day engagement that saw the destruction of the Sassanid elephant corps and the death of their commander, Rostam Farrokhzad.
Following the victory at al-Qadisiyyah, Sa'd set his sights on Ctesiphon, the Sassanid capital. Upon reaching the Tigris River, he found the waters swollen by a heavy tide, making a traditional crossing impossible. Driven by the urgent need to prevent the Sassanid king, Yazdegerd III, from relocating the imperial treasury to Hulwan, Sa'd made a daring decision. He ordered his entire cavalry to plunge into the fierce torrents. The Sassanid defenders, watching from the castle, famously shouted that the invaders were 'crazy' for attempting such a feat without boats.
The gamble succeeded. The Rashidun archers repelled the Sassanid cavalry by targeting their horses' eyes, and the army successfully crossed the river. They found the palace abandoned, as the king had already fled. Sa'd secured the vast imperial treasury, which provided each of his soldiers with at least 12,000 silver dirhams. He later established the garrison city of Kufa, serving as its governor under Caliph Umar. Despite his military successes, Sa'd’s life was marked by both high honors—being promised Paradise by Muhammad—and political friction, eventually leading to his dismissal from his post following complaints about his conduct.
Sa'd’s legacy is multifaceted. Beyond his battlefield achievements, he is remembered for his steadfast faith, having converted at seventeen despite his mother's hunger strikes, and for his role as a leader of the neutral faction during the First Fitna. While some traditions claim he introduced Islam to China in 651, these accounts remain disputed by historians.
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