The Battle of the Trench (Arabic: غزوة الخندق‎, romanized: Ghazwat al-Khandaq), also known as the Battle of Khandaq (Arabic: معركة خندق‎, romanized: Ma’rakah al-Khandaq) and the Battle of the Confederates (Arabic: غزوة الاحزاب‎, romanized: Ghazwat al-Ahzab), was a 27-day-long defence by Muslims of Yathrib (now Medina) from Arab and Jewish tribes. The strength of the confederate armies is estimated around 10,000 men with six hundred horses and some camels, while the Medinan defenders numbered 3,000. The largely outnumbered defenders of Medina, mainly Muslims led by 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.