Strife: Quest for the Sigil (1996)

You are a wandering mercenary, lead to the small town of Tarnhill by rumors of conflict between The Order, a well-equipped religious monarchy, and The Front, the rag tag resistance movement. The town is under martial law. Framed for looting, you have been disarmed and hauled away by a couple of Order Acolytes to the local sewage plant for questioning. Actually, they intend to execute you quickly and dispose of your remains in the muck. What they didn't expect, though, is the knife you keep concealed for situations just like this one...