As you see below this picture, it was on chapter 29 where Goblin Slayer and Sword Maiden meet to together and then the Sword Maiden seems like have a flashback and see Goblin Slayer as below this picture. (A helmet with a horn.)
And I found that the first equipment that Goblin Slayer equip also have a similar like that above picture. (*Have the horn.) Here's the first equipment that Goblin Slayer wearing.
So in the old time when sword maiden get humiliate by the goblins, did Goblin Slayer save the Sword Maiden?