Grimoald then made an agreement with the Avars who invaded the duchy and killed Lupus. They then refused to withdraw and continued their raids until Grimoald himself intervened and managed to induce them to return to Pannonia.
Grimoald subsequently formed an alliance with the Avars who had invaded the duchy, resulting in Lupus' demise. However, they ultimately refused to depart and continued their attacks until Grimoald personally intervened, successfully convincing them to return to Pannonia.