One of the few territories doing slightly better was located somewhere northeast of Alterra, a village named Rows Village.
While many territories had fallen, many people—native or Terran alike—becoming refugees and having to travel under the burning sun, they had managed to hold on... so far.
This was one of the villages that had thought of corralling the monsters to hunt them more effectively.
They had zoned a certain less-developed area to create an enclosure. While most of the territory still fought against the monsters outside the battlement, they would leave a section unguarded, allowing some monsters to go through.
They also created a gate there because they knew monsters targeted those by instinct, and therefore would pile easily so they could focus their attacks more. The gate would also make it easier for them to get the carcasses inside.