I read the manga starting at volume 1, so when I saw this scene I immediately figured that it was a huge reason Guts is a complete asshole during the Black Swordsman arc. Obviously the Eclipse piled on to that trauma, but I only knew the Eclipse was a big event at that point because I hadn't been spoiled.
I agree with what CC said about the rape scene(s) not being tacky and for pure shock. The rapes are shown in a way that makes the reader angry... Angry at the rapist that is. I wanted to see Donovan dead right there, and I wanted to see Griffith murdered after the Eclipse.