Here is the next installment where there is a connection of the Balkans mentioned - starting at the 7:30 minute mark:
https://www.youtube.com/watch?v=GT14RRahIWw&
Mentions Florina and how that is currently held by the Serbs and the Bulgarians are going to attack
Following on from that video they do an episode on Greece with Macedonia mentioned as constituting as being part of Greece (annoying considering it is more complex than that):
https://www.youtube.com/watch?v=qaeTv0GzjIc&
Then the next video shows Bulgaria attacking the allies in the balkan region (around 5:50 point):
https://www.youtube.com/watch?v=ppoSpRK5nXY&
Next video that mentions Macedonia - specifically Florina and Bitola (Monastir):
https://www.youtube.com/watch?v=kLvZ...6VS6w3KxuKsMvT