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Tear Jerker: Nintendo Wars
Nintendo DS had one in Advance Wars: Days of Ruin, when Brenner, injured and alone, stalled the enemy long enough for his unit as well as former enemies to escape. Will and Lin were hit particularly hard for some time.
Also how we are introduced to Will in Days of Ruin. He was the only survivor from an entire military academy and had to dig himself out of the rubble. Then he spent an unknown amount of time wandering the remains looking for anyone. His look ◊ on his face really shows it