Here is what I think will happen in avatar Day of black sun.The heros who have gathered up an army by now,will attack the fire nation.Mutch of the army will be in earth kingdom tanks and drills,judging from the trailer.Azula,who has told the firelord by now about the invasion.Will be prepared,and have many of there machines ready for battle.Big battle insues,and on the trailer it showed awar vehical explode presumedly killing many pepole.I think the firenation will eventually fall back.Then suddenly 100s of war balloons apear and the battle resumes.Eventually,The earthkingdom will retreat.Falling back to the westeren airtemple,to think of another plan.

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