The actions of Hamilcar, and his immunity to defeat, plus the stalemate at the siege of Lilybaeum caused the Romans to start building a fleet in 243 BC to seek a decision at sea. However, the constant skirmishing without ultimate victory may have caused the morale of some of Hamilcar's troops to crack and 1,000 Celtic mercenaries tried to betray the Punic camp to the Romans, which was foiled. Hamilcar had to promise considerable rewards to keep the morale of his army up, which was to produce near fatal problems for Carthage later on.