The Battle of Drina took place in the 10th century. The Magyars, led by Kisa (Kiš) invaded and started raiding the Bosnia region. Prince Časlav

Caslav Klonimirovic

Časlav Klonimirović or Časlav of Serbia was Prince of the Serbs from ca. 927 until his death in 960. He significantly expanded the Serbian Principality when he managed to unite several Slavic tribes, stretching his realm over the shores of the Adriatic Sea, the Sava river and the Morava valley...

 (927-960) assembled an army and the two fought along the river banks of the Drina

Drina

The Drina is a 346 kilometer long river, which forms most of the border between Bosnia and Herzegovina and Serbia. It is the longest tributary of the Sava River and the longest karst river in the Dinaric Alps which belongs to the Danube river watershed...

 (downstreams from Foča

Foca

Foča is a town and municipality in southeastern Bosnia and Herzegovina on the Drina river, in the Foča Region of the Republika Srpska entity.-Early history:...

), Kisa was killed and the Serbs came out victorious.

The widow of Kisa begged the Magyar King to send an army to revenge his death, and the two would fight against, at the Battle of Srem (modern Mačva

Macva

Mačva is a geographical region in Serbia, mostly situated in the northwest of Central Serbia. It is located in a fertile plain between the Sava and Drina rivers. The chief town of this region is Šabac. The modern Mačva District of Serbia is named after the region, although the region of Mačva...

).