Alderamin on the Sky

Season 1, Episode 8: Some Day, for the Third Time...

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Ikta and his soldiers are sent to deliver supplies to the struggling imperial armies as the war continues. Unused to fighting in the high mountains, and led by incompetent leaders the imperial soldiers suffer heavy casualties. Ikta devises a brilliant stratagem to retake an enemy fortress, but when a messenger begs him for help in saving his allies, he's forced to choose between risking his own soldiers life, and bringing another imperial force to certain doom.