 Complete the following phrase:  In 288 BC the Mamertines seized the city by treachery, killing all the men and taking the women as their wives. The city became a base from which they ravaged the countryside, leading to a conflict with the expanding regional empire of Syracuse. Hiero II, tyrant of Syracuse, defeated the Mamertines near Mylae on the Longanus River and besieged Messina. Carthage assisted the Mamertines because of a 