Severance (2006)
Synopsis: "Awash in blood and black humor, director Christopher Smith's inventive horror flick follows a sales group -- employed by an international weapons company -- as they head for a team-building retreat at a remote lodge in Hungary. Before you can say "mayhem," a band of vengeful, psychotic commandos turns the tables and puts the merchants on the wrong end of their wares. Toby Stephens, Laura Harris and Danny Dyer star."
Synopsis compliments of Netflix