Ben Bowie and His Mountain Men #13 (1958)

Ben Bowie and his mountain men encounter a dangerous raider who has been stealing beaver pelts and attacking trappers. After the raider drowns a companion, Ben and his team pursue him to a beaver lodge with an underwater entrance and a chamber above the water. The story culminates in a confrontation where Ben and his men chase the raider through the forest, using a falling tree as a weapon to stop him.