• Sending your 3 Pikemen on this attack is a good idea.
• When your army comes up in the unit cycle, use the minimap to quickly scroll the map over to the province where you see the invading Fleet at the shore.
• If you previously gave your Pikemen orders to defend, they will not come up automatically in the unit cycle. Click the garrison tents where they are defending to select them. 
• Since the capital city is a port, units encamped there may attack into the overseas province with your landing site.
• To order the attack, hold the cursor over the target province. It will look like a set of crossed swords. Click on the province. A red attack arrow on the map confirms that the attack is ordered.
• The battle will take place after you click the ‘End Turn’ button.
• For more help, click on the question mark button.