As agreed, Theuderic ceded northern Neustria to Clothar, but then turned around and organized an invasion of Neustria.
However he died of dysentery in Metz in 613.
His troops dispersed immediately, and Brunhilda placed her great-grandson Sigebert II on the throne of Austrasia.

At that time, Warnachar, mayor of the palace of Austrasia, and Rado, mayor of the palace of Burgundy, abandoned the cause of Brunhilda and her great-grandson, Sigebert II, and the entire realm was delivered into Chlothar's hands.
Brunhilda and Sigebert met Chlothar's army on the Aisne, but the Patrician Aletheus, Duke Rocco, and Duke Sigvald deserted the host and the grand old woman and her king had to flee.
They got as far as the Orbe, but Chlothar's soldiers caught up with them by the lake Neuchâtel.
Both of them and Sigebert's younger brother Corbo were executed by Chlothar's orders, then proceeded to execute many of the family members of this house except Merovech, his godson, and perhaps Childebert who had fled.

Brunhilde was accused of murdering ten members of the Neustrian royal family, as well as other Frankish royalty, and was tried and convicted.
She underwent a very severe torture and execution by being dragged on the back of a horse and drawn-and-quartered.
 After this victory, Clothar was left as the sole royal ruler of the Frankish peoples and consolidated his power.
As agreed, Theuderic ceded northern Neustria to Clothar, but then turned around and organized an invasion of Neustria. However he died of dysentery in Metz in 613. His troops dispersed immediately, and Brunhilda placed her great-grandson Sigebert II on the throne of Austrasia. 
At that time, Warnachar, mayor of the palace of Austrasia, and Rado, mayor of the palace of Burgundy, abandoned the cause of Brunhilda and her great-grandson, Sigebert II, and the entire realm was delivered into Chlothar's hands. Brunhilda and Sigebert met Chlothar's army on the Aisne, but the Patrician Aletheus, Duke Rocco, and Duke Sigvald deserted the host and the grand old woman and her king had to flee. They got as far as the Orbe, but Chlothar's soldiers caught up with them by the lake Neuchâtel. Both of them and Sigebert's younger brother Corbo were executed by Chlothar's orders, then proceeded to execute many of the family members of this house except Merovech, his godson, and perhaps Childebert who had fled.
Brunhilde was accused of murdering ten members of the Neustrian royal family, as well as other Frankish royalty, and was tried and convicted. She underwent a very severe torture and execution by being dragged on the back of a horse and drawn-and-quartered.  After this victory, Clothar was left as the sole royal ruler of the Frankish peoples and consolidated his power.
Chlothar II