Decisive Slavic victory According to the contemporary Chronicle of Fredegar, the Battle of Wogastisburg (also called the siege of Wogastisburg) took place between Slavs (Sclav, cognomento Winidi[1]) under King Samo and Franks under King Dagobert I in 631 or 632.
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 siege near a place referred to as Wogastisburg.
The location of the siege has not been determined because the primary source, Fredegar's chronicle, gives no geographical specifications.
[2][Note 1] In fact, there is no conclusive evidence for any of these locations and it is even possible that the term Wogastisburg referred only to a kind of temporary encampment rather than a permanent settlement, in which case establishing a definite location would be impossible.