Board Thread:General Discussion/@comment-36768275-20180830174832/@comment-28895263-20180906053240

If Jon and Daenerys can invent air combat tactics, it could be trivial.

1) Jon, riding Rhaegal, taunts the Night King, riding Viserion.  He chases Jon, flying beyond the line of battle.

2) Daenerys, on Drogon, dives from high altitude, getting behind Viserion.  Drogon is equipped as the Dothraki Longbow[*] Dragonfire Gunship:  Six Dothraki archers, with hundreds of rounds of dragonglass-tipped arrows.  Maybe even a small ballista.

3) If air-to-air fire doesn't take out Viserion and / or the Night King, Jon leads the dogfight over the narrow sea, where Daenerys' navy has been equipped with ballistae, and dragonglass rounds.

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[*] Yes, I know that Dothraki use composite recurve bows. But the phrase doesn't flow as well.