Firstly, after years of oppression, the Elf Tribe undoubtedly harbors resentment internally. If they were to possess enough strength, it is inconceivable that they would not seek revenge on the Enemies who oppressed them.
Secondly, and most importantly, at this moment, the changes in the Elf Tribe have already been noticed by the Races that oppressed them. And since these changes have been noticed, those Races would inevitably want to ascertain the specific Information behind these changes. Under such circumstances, unless the Elf Tribe wants to face annihilation, even if they initially had no thoughts of rebellion, they would certainly have to fight those Races.
It's likely that at that time, those Elves did not expect the changes within their Tribe to be discovered so swiftly! As a result, the Elf Tribe was not fully prepared for War against those Races when they initiated Action against them.
