As the name suggest make your army by forming a group and then attack enemies
Join And Attack is a game where you start by your own and have to make your army by moving towards the grey players and as they enter your boundaries they will join you and the same way try to join with as much players as possible.
Now as you have your army ready, move towards enemies to fight with them.
Try to collect armed people and giants first to make your allies strong.
As the level progress more and more stronger teams will try to attack you so you have to move quickly and attack them before enemy form his allies.