To attack another player, select a hero leading an army and click on the targeted town on the world map. Then click on the "Attack town" button to open the battle calculator and prepare your fight. If you have a troop scouting report for the town you want to attack, it will be displayed in the battle calculator. It's recommended that you have a fresh troop scouting report before attacking your foes. When you're ready to fight, click the "OK" button on the battle calculator.