Bulgarian Divisions (5 Serbia and Serbian Macedonia) (2 in former Greek Thrace ) Note. Reports indicate that three German divisions may shortly be sent to Attica but it is not known of what type they will be or from what theatre they will come. There is also an indication that a mountain division may shortly be going from the Balkans to Russia. 4. The most active guerilla forces are concentrated in the mountainous districts of Central and Southern Yugoslavia. Guerilla activity in Greece, however, especially in the mountainous regions of the North, is on the increase.