 In addition, there were fortress troops consisting of approximately six battalions, the Colonial Corps of about 4,000 troops which was stationed on Hokkaido and the Ryukyu Islands, and a battalion of military police in each of the districts.In peacetime the regular army had a total of fewer than 70,000 men, while after mobilization the numbers rose to over 220,000.Moreover, the army still had a trained reserve, which, following the mobilization of the first-line divisions, could be formed into reserve brigades.