Your Majesty!
There are so many enemies around, and every one of them is trying to get to our treasures! I think Your Majesty understands that we won't withstand without allies!
Objective: study the "Diplomacy" science, construct the Diplomatic Corps building and form an alliance
Hint:
The number of allies is limited to the "Diplomacy" science level. In order to have more allies continue studying the "Diplomacy" science. You can launch a Joint Attack together with your ally. Up to two allies can send troops to your City to reinforce the defence. The alliance rupture takes 24 hours.