One great problem of frontline system is constant reshuffling of it. This is partly caused by units not able to keep up the changing frontline. They are filling a gap that no longer needs to be filled due to advancement. However, if these units are allowed to move through empty enemy territory then half of the not able to keep up shifting frontline problem can be resolved. This is because AI can now fill the gap of enemy retreat ahead of time. Otherwise it will move into 'fake gap' that attacking units creates because they are the one marching forward.
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