Dragon Flyers

The Dragon Flyers are a group of Dragon Hunters (and possibly Drago's Army) which fly on the back of Dragons. Unlike the Dragon Riders they force the Dragons to fly where they want and to shoot at targets. The Dragon Flyers use Singetails to carry out their missions.

History
Following Drago Bludvist's attack on a meeting of chiefs to discuss the dragon scourge they all faced, Krogan gave Drago a Rumblehorn to ride in order to make his escape. Only Stoick survived the attack and saw this.

Obtaining the Dragons
Following the apparent demise of the Dragon Hunters' Chieftain Viggo Grimborn, Krogan took over the hunters. With them he captured several Singetails using a captured Death Song to immobilize them.

Driving the Riders Off
After forging an alliance with Viggo Grimborn, Krogan led his fellow Dragon Flyers in attacking Dragon's Edge. His flyers were able to force Hiccup and his riders to retreat to Caldera Cay.

Pursuing the Riders and Losing Dragons
The Dragon Flyers then attacked Caldera Cay and forced the riders to retreat back to Berk. Figuring the Flyers would be still be in suit, Stoick had the people of Berk get ready to defend their island. He then had Berk prepare its fleet to retake the Edge for his son and the other Riders. Hiccup and Berk's Auxiliary team managed to dismount the Flyers, allowing the Dragons to fly to freedom and the Flyers with much fewer dragons under their control.

Obtaining Heather's Lens
Krogan meets Heather at the Northern Markets with some of his Flyers, in hopes of getting to her Dragon Eye lens. They chase her, Johann, and Snotlout down, capture Windshear, and use the dragon as hostage in place for the lens.

Trivia

 * Several of the Flyers have tatoos on their arms that are resemble Krogan's belt, cape pin and Eret's branding.