After setting up the Terrain features outlined on the Layout Cards, it is time to put Fill-in terrain on the battlefield. Fill-in terrain are small terrain features of any type (Scatter, Area, Obstacle). The EO should put between 16–24 pieces of Fill-in terrain on the battlefield in such a way to make visually interesting and thematic battlefields. Unlike the above terrain features, Fill-in terrain does not have to overlap a marked spot on the Terrain Layout Cards and can put anywhere on the battlefield, even overlapping larger terrain features.