Before the start of the game, each player must select 5 units. Some of these are troops that can be spawned by the player at their position, some are buildings that spawn troops automatically at fixed intervals, some are buildings that give upgrades to other units, and some are defensive buildings that attack enemy units automatically. Different combinations of units can be made for a vast number of strategies, so try them out and see what works for you!
In addition to their chosen 5, each player can always build four basic units: