 The Crusade gave him a further opportunity, which he took after the Siege of Antioch, taking possession of the city and establishing the Principality of Antioch.The size of the entire crusader army is difficult to estimate; various numbers were given by the eyewitnesses, and equally various estimates have been offered by modern historians.Crusader military historian David Nicolle considers the armies to have consisted of about 30,000–35,000 crusaders, including 5,000 cavalry.