 Complete the following phrase:  The Japanese 15th Army was formed on November 9, 1941, as a component of the Southern Expeditionary Army Group for the specific task of invading the British colony of Burma. To do this the army, then based in Indo-China, needed to transit through Thailand. On December 8, 1941, the 33rd and 55th Divisions of the army spearheaded by the Imperial Guard 