Well, the problem is that with one turn per year, it now takes an army about 10 years to march from Rome to the English Channel. That is assuming, of course, it doesn't have to stop to fight along the way. It takes about 5 years to sail from Lilybaeum to the Straits of Gibraltar, if I remember correctly. The movement speed increase somewhat compensates for that. It would probably be more accurate to call it "Travel mode"; the army is more focused on speed than scouting, so it can go farther but suffers penalties if attacked.
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