Some chapters were over after one fight: my test bot landed once, won, and the other side had nothing left to send.
So the enemy counts now. It remembers what it has seen of your army. If its next wave would be smaller than that, the wave stays home and a few scouts come to look instead. Land in force and everyone near comes.
Chapter 2 with the same bot now takes eight or nine fights. Two games in three had no winner after 45 minutes.
In the next update. Microsoft Store: 5019 — https://apps.microsoft.com/detail/9NKSL14W67S0?cid=itch_devlogs_enemy