Salman the Persian
The largely outnumbered defenders of Medina, mainly Muslims led by Islamic Prophet Muhammad, dug a trench on the suggestion of Salman the Persian, which together with Medina's natural fortifications, rendered the confederate cavalry (consisting of horses and camels) useless, locking the two sides in a stalemate. Hoping to make several attacks at once, the confederates persuaded the Muslim-allied Medinan Jews, Banu Qurayza, to attack the city from the south. However, Muhammad's diplomacy derailed the negotiations, and broke up the confederacy against him. The well-organised defenders, the sinking of confederate morale, and poor weather conditions caused the siege to end in a fiasco