 In the field of military organization, Napoleon borrowed from previous theorists such as Jacques Antoine Hippolyte, Comte de Guibert, and from the reforms of preceding French governments, and then developed much of what was already in place.He continued the policy, which emerged from the Revolution, of promotion based primarily on merit.Corps replaced divisions as the largest army units, mobile artillery was integrated into reserve batteries, the staff system became more fluid and cavalry returned as an important formation in French military doctrine.