On my Sweboz game I had a while ago, I had a similar experience, kind of. All of Italy was basically unoccupied, but I built a spy and sent him to Sicily, and the Romans had like 3 huge armies. I was overconfident, and my army got destroyed, but I boosted my economy by completely destroying everything in Italy. The general who died in Italy, his son came of age in Capua before it rebelled, and I hired a full army of mercenaries and continued my pillaging.
Carthage likes to do that too. They often leave Africa completely unguarded and just have a huge army in Iberia, doing nothing.
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