I find this part of Eilhart's text fascinating. Tristan's father dies and Tristan goes to his kingdom to consolidate matters. He leaves Governal as his regent, then goes back to Brittany where his brother-in-law Kehenis has been battling against this Count Riole ever since his father has died (as shown in the highlighted part above).
Tristan goes to support Kehenis by fighting against his enemies. In the process, he gets badly injured by heavy stone that fell on his head because he didn't have his helmet on.
The injury is so bad that Tristan gets scarred, leading for him to be hardly recognizable. Later in the narrative, Tristan being scarred works in his favor when coming to visit Isolde clandestinely.
This part in the Tristan narratives is deeply interesting. Because here you have Tristan being a affected by a face injury, due to battle. And there's so much potential in exploring this through many venues.
Oberge, E. (1978). Eilhart von Oberge’s Tristrant. University of Nebraska Press.