Wulf and Eofor
Wulf and Eofor are two Geatish brothers who are part of a blood-feud between the Geats and their rival tribe, the Swedes. Ongentheow, king of the Swedes, killed Wulf in battle; in return, Wulf's brother Eofor killed Ongentheow. As a result, the Swedes still hold a grudge against the Geats, and war is sure to erupt once again.
Wulf and Eofor, brothers who fight together, sharply contrast with the fratricidal brothers Herebeald and Haethcyn. However, even though there is no strife between Wulf and Eofor, their very loyalty to one another results in inter-tribal conflict. There just doesn't seem to be any way to win for brothers in this story.