The stage starts off with a Brollow, and Brollow will spawn slowly. After you attack the base, a huge horde of Brollow will be spawned.
Ururun is very useful, due to her good damage and quick attack rate. Keep her protected with meatshields, as the Brollows can kill her easily. Use 4 meatshields and Drama Cats if you have them and the stage will be much easier!