RTW can't handle a guerilla war. It's up to the player to stall the conquest of Sicily if he so chooses. For example in my Carthaginian campaign the first Punic War started in 267bc when a Roman fleet blockaded Carthage after I had taken Messana. In about 265 they took Messana, I took it back in maybe 262. 256 I sacked Syracusa to fund my mobilization. 255 they really started bringing armies to Sicily and took Messana and in a few years Syracusa went too. In the ten years that followed Hamalcar won a couple of heroic battles and in 245 his army was beaten and he left for Iberia. In 241bc Lilibeo fell and there was peace. It went pretty nice, although I took Messana too early.
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