The Wings of War, Part 1.The Riders are still recovering on the Defenders' island when the Dragon Flyers appear again, taking advantage of Hiccup's empathy towards dragons and forcing them to retreat once more to Berk. Stoick and Astrid try to convince Hiccup that the Singetails must also be treated as the enemy and potentially sacrificed for their victory, but Hiccup remains firm on their innocence and is left lost while the rest of Berk prepares for war. To try and find an alternate method to victory, Hiccup and Toothless travel alone to Storehouse Island to study the Singetail and find behaviors that will give them an advantage in battle, but this attempt quickly leaves Hiccup at its mercy.