This doesn't work for me. My Thirteen colonies is at 6 simultaneous wars being declared on them just after they formed and it says invalid target -1000 for me to enforce peace on natives. Its bad enough how silly North American mechanics are to be viable but these 'bugs' are just bad for gameplay.You can help them by using the diplomatic action enforce peace on the attacker. If they accept, the war ends in a white peace. If they decline(which is very likely), you will enter the war on the side of your CN and become the warleader.
Invalid target usually means that you didn't select in which war you want to enforce peace. You have to click on the flag of your CN in the enforce peace interface to specify that you want to enforce peace in the war against your CNThis doesn't work for me. My Thirteen colonies is at 6 simultaneous wars being declared on them just after they formed and it says invalid target -1000 for me to enforce peace on natives. Its bad enough how silly North American mechanics are to be viable but these 'bugs' are just bad for gameplay.