Battle of Gambolo

The Battle of Gambolo was an event from Derlavaian history. The Algarvic barbarians defeated the Kaunian Empire. Scholars a thousand years later wondered, if the Kaunians had won this battle, would the Empire still endure today?

Literary comment
This appears to be an allusion to the Battle of the Teutoburg Forest, a personal favorite subject for Harry Turtledove.