The following year, in 1891, Rappe wrote a memorandum that explained in more detail the budget, which suddenly had risen to 4.5 million kronor, and would finance the construction of two strongholds at Paglaberget and Åberget with a total of six long cannon, ten howitzers and eight quick-firing cannon, all in armoured turrets, along with machine guns and bunkers, barracks and supply depots. The plan included a reserve battalion of 1,000 men, an artillery battalion of 600 men, an engineer company of 120 men, and supply and depot personnel. Axel Rappe's large study on the permanent fortifications of Sweden—a mandate given to him in 1882—was published in 1892 and cemented the view that a central fortress was needed in Boden to support and supply troops gathering between the Lule River and the eastern border, alongside the strengthening of the coastal defences at Stockholm, Gothenburg and Karlskrona.