"Mercenary" represents a pivotal release for Bolt Thrower, introducing substantial changes to the group's lineup. While the music retains the band's characteristic style, it features an updated roster comprising longtime members Barry Thompson and Gavin Ward on guitar, Jo Bench on bass, vocalist Karl Willets, and newcomer Alex Thomas on drums. Notably, this album also marks Bolt Thrower's debut on Metal Blade Records. These alterations, however, have minimal impact on Bolt Thrower's overall sound. The band maintains their longstanding tradition of delivering increasingly precise performances, with all members contributing to faithfully reproduce their trademark sound. Thomas' exceptional drumming skills stand out, though some argue that Andy Whale's slightly unpolished style held its unique charm. While "Mercenary" showcases technical prowess, it lacks the material to rank as a standout Bolt Thrower album. Existing fans of the metal act will appreciate this 1998 release, but newcomers may find it worthwhile to explore "For Victory" or "The IVth Crusade" before delving into "Mercenary."