system
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human
[ATLA] what was the plan of the rebellion during the 100 year war? Did they plan on just surviving or eventually storming the fire lords castle?

Also, why didn't the earth and water nation team up opposed to each having their own part in the rebellion?
gpt
It wasn't really a rebellion, it was an actual war between multiple sovereign governments with their own standing armies (except for the Water Tribes which had a warrior class rather than a military; and the Air Nomads who had no warriors or military to speak of). 

As for alliances, in fact they did ally with each other, Sokka was the only "adult" (older than 10 years old) male left in his village because the men had left to assist the Earth Kingdom in the war. As for the plan? It was presumably to survive and resist occupation until the Fire Nation ran out of resources and could be made to retreat. Unfortunately the Industrial advantage of the Fire Nation gave them such an edge that they could keep returning despite likely multiple retreats (a good analogy for the Hundred Year War is likely a combination of the colonization of the Americas and Imperial Japan's conquests in Asia and the Pacific).