Indeed. When an occupation begins such a quickly-established guerilla organization, especially if many civilians keep weapons and are willing to resist, become

Indeed. When an occupation begins such a quickly-established guerilla organization, especially if many civilians keep weapons and are willing to resist, becomes a huge ordeal for an army of occupation. Any potential aggressor, whatever the imbalance of forces, has to take it into account. Where other major parameters (such as geography, climate and existing infrastructures) favor this guerilla force, then even a huge imbalance may be void.