>>2037340Probably better than the average levied commoner. The mercenaries were their captain's assets, each with gear, experience, and training that was not easy to come by. This made their lives worth inherently more than a levied commoner. If the men got destroyed then their captain would lose his source of income, so he would be selective in what contracts he takes and how he uses the men.
Plus there was little reason to massacre mercenaries in battle. Doing so would earn that king a bad reputation among mercenaries and lose him access to their services. It's kind of like how nobility was more often captured than executed. Mercenary lives were simply worth more because they could be ransomed for their inherent values, but most commoner lives could not and were therefore worth less. They were not worth as much as nobility because they had no part in dynastic succession, but they were certainly worth more than a commoner subject who was simply ordered to show up to a war. So in addition to having better survivability due to gear and training, they would also be executed much less frequently. Source: I made it up but I choose to think true.