She vowed to 'avenge herself' [=to get revenge], saying she would make him pay for what he had done to her.
The team is out to 'avenge' last week's defeat. [=to defeat the team that they were defeated by last week]
They vowed to 'avenge' their father by capturing and punishing his killer.
(..) Home? I don't know. Difficult to return. When we return, Hvitserk and I, and our brothers we will have to avenge our father's death. And that would be difficult for you too. You would not be welcome, for what you did to all of us. (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17
(..) Where is our father? King Ecbert handed him over to King Aelle. Our father is probably dead by now. And we will have to avenge him. We have to prepare. The sons of Ragnar will come to claim vengeance. There is no better man than you to make every (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17