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Suggestion Idea: An option that requires the players to physically choose the next target when the armies in the current attacking territory run out.
Specifics: A simple option. When an attacking territory runs out of armies, instead of jumping to another potential attack, you get the illegal attack message.
Why it is needed: Because there are people like me who get button happy, and end up messing themselves over. Although I suggest this as an option, I really think for beginners this would be a preferable default, with the quicker free-flow style that is currently in use could be an option for more experienced players.