Late in the same year, the Byzantine Empire invaded Bulgaria as it suffered famine and natural disasters.

Three days after the initial incident, Greek troops invaded Bulgaria.

At the same time he persuaded the Mongols to invade Bulgaria from the north.

A fleet was sent into the Black Sea and an army dispatched to invade Bulgaria.

Then Russia declared war and invaded Bulgaria.

The weak divisions sent by the Axis powers to invade Bulgaria were easily driven back.

However, late in the same year, the Byzantine Empire invaded Bulgaria during a period of famine and natural disasters.

Simultaneously with the Hungarian attack from the north, the Byzantines invaded Bulgaria from the south.

In 1352 new Turkish forces invaded Bulgaria, devastated its southern areas and returned with huge spoils.