Battle of Wogastisburg
According to the contemporary "Chronicle of Fredegar", the Battle of Wogastisburg was a battle between Slavs ("Sclav, cognomento Winidi") under King Samo and Franks under King Dagobert I in 631. The Frankish armies advanced into the area of the Slavic tribal union in three groups - Alamanni, Lombards, and Austrasian Franks. The first two were quite successful, but the main fighting force was defeated in a three-day battle near a place referred to as "Wogastisburg".