The
Battle of the Trench also known as the
Battle of the Confederates , was a 27 - day long siege of
Yathrib (now
Medina) by
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 battle coincided with harsh winter weather of January/February 627.