Since the nineteenth century, the mercenary hypothesis has often served to understand the distribution of objects or practices in the Celtic territories. But if the mercenary is factor of mobility, it’s not sure that the return to the home country was as important as modern studies have left thought. Indeed, the mercenary appear to have resulted, especially in the western Mediterranean, to forms of temporary or permanent mobility according to the powers that were recruiting. This paper will focus on his assumption in light of literary, monetary and archaeological examples.