The Rashidun army was the primary arm of the Islamic armed forces of the 7th century, serving alongside the Rashidun navy. The army maintained a very high level of discipline, strategic prowess and organization, along with the motivation and initiative of the officer corps. For much of its history this army was one of the most powerful and effective military forces throughout the region. At the height of the Rashidun Caliphate, the maximum size of the army was around 100,000 troops.