C91 The Legend of the Little Dragon and the Last Archer
It won't take long for Lil'Dino to go east to Boston. Because this operation was relatively dangerous, not everyone could go. Hence, Lil'Dino left Medea and Twilight Sparkle in a safe place, while Peter and Reginald stayed behind as well. After making preparations, Lil'Dino and the rest set off for Hitler's den, the "Wolf's den."
In fact, the name "wolf cave" was a relatively secret codename