In Defense of Thuil

From the back cover:

Swamp raiders from the jungle province have been harassing the small border towns of Wynhelm for years, with Thuil being a frequent target. Raiders no longer attempt to invade Wynhelm over the many small bridges spanning the Black River, but have taken to rafting large groups of warriors through the calmer sections of the water. Raiding parties of a dozen or so desperate bandits have turned in to organized troops of lizardmen and red cloaked priests. The snake god Sshanasa is surely behind these recent attacks! A low level adventure for 3-5 players set in Terra Minor.

In Defense of Thuil is compatible with TSRS, OSRIC (1E), and 5E!