Constant warfare was the job description of some of these factions.
Romani obviously had endless warfare in Italy at first then against Carthage constant warfare with Celts in the North, with all of the Greek factions, ultimately a war without end in the Iberian Penninsula, after they defeated the Selucids they recieved wars in Asia Minor, there were also Getai raids to deal with.
Carthage had constant warfare in Sicily before the Romans gave them the boot, much warfare in Corsica and Sardinia, after losing the First Punic War the Barcids brought Carthage into war with very large numbers of Spanish tribes, and when Carthage was disarmed by treaty the Numidians made a lot of trouble for them. Unlike Rome the secret of Carthage was the mercenary.
The Diodachi were constantly at each others throat, I think everyone here knows about how merciless the Ancient Greeks would be to each other.
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