What motivates king uther to resume war against the duke of tintagel?

King Uther is motivated to resume war against the Duke of Tintagel primarily by his desire to reclaim his honor and assert his authority over the rebellious duke. The conflict arises from personal grievances and Uther's ambition to solidify his power in Britain. Additionally, the Duke's defiance poses a threat to Uther's reign, compelling him to take decisive action to maintain control over his kingdom. Ultimately, Uther's motivations are a blend of personal vendetta and the need to uphold his kingship.