The road to Seminole

On the road to Seminole you'll encounter two creepers - a Strider and a Pony SS. You should take them out before moving on - the townsfolk of Seminole can wait. Take a right at the end of the highway, then a left at the next intersection. Take another left and follow the road into town.

Seminole

Five creepers are waiting in town - four Caveras and a street van. Take out the van first, then hit the Caveras. Try to not let them take out any buildings, primarily the post office. There are also a few mail trucks driving around town, so watch your stray fire. If any normals die, the scenario is a failure.

The remainder is just straightforward combat. Finish off the creepers, and you've finished the scenario.