Note: I'm sorry if the clip that you wanted is not available in your country. Most movies are licensed and will take months for them to be playable worldwide.
This is how writers should approach battles: CASUALTIES CASUALTIES CASUALTIES. How many would actually fall in battle? versus How many would you save just because they're nice characters? Write war casualties as if there's a fake-out plot twist so that the impact of the battle is FAIR. You can't have all your faves alive after such a intense fight.
I will say this and I won't regret saying it. This movie is absolutely beautiful from the animation to the story to the songs. This is one of the songs that makes me actually cry for how beautiful it is especially the "heaven knows your name and I've been praying to have you come here by my side" BEAUTIFUL
Trivia: At the end of the credits in the song list it shows that the OST for Hero's Duty was made by Skrillex. Dennis Haysbert (aka the All State guy who says "Are you in good hands?") is the game's Narrator and the hologram general who awards you the metal.