The story is related to the this one here:Mainly like you said: Gunship crashed, incoming droid army, LAAT Gunship reinforcement arrives with troopes that will try to save the ones from the crashed gunship. Only could save one, but the one lost his arm and his leg. The dead clone got shot when arriving to the hot zone. The thing in the bottom right corner is a part of the crashed gunship (The laser canon cabin). But glad you found it out, man!