Declare war on the target country. This will open a confirmation window where player can ask any allies to join the war as well. This choice is later available by selecting the enemy country in diplomacy screen and using the "Call to arms" option.
- Declaring a war happens instantly. It is recommended to ready the Armies at the borders in advance for a quick offence or defence.
- The chance of an ally joining the war depends on the positive diplomatic opinion between player and ally, and negative diplomatic opinion between target and ally.
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