There are several different maps in WarFriends where the battle takes place. Each map has its unique design, layout and requires its own tactical approach.

You can choose your preferred map on the 'Prepare for battle' screen. However, it is not guaranteed that when you choose a map, you'll always play on it. If two players have a different preferred map (or one has a preferred map and the other has random), the player who hosts the match is the one who determines the map selection. Who is the room master and who is the client gets determined by the server during matchmaking, and it can't be affected in any way.