The Versailles treaty restricted the numbers of the German army to seven divisions of infantry and three of cavalry, for a total of 100,000 men, and no more than 4,000 officers. Conscription was prohibited, and civilian employees engaged in forest protection, customs inspection and other official duties could not receive military training. The military was to be exclusively devoted to the maintenance of order within German territory and control of the frontiers. The Treaty further prohibited the construction of aircraft, heavy artillery, submarines, capital ships, and tanks, and the production of materials for chemical warfare.