Talk:Magic Items/@comment-37424195-20181106092449/@comment-25856498-20181106185150

You should see the "Boost Army" button next to the Surrender/End Battle button if your troops aren't already boosted. If you want to use the Power Potion for that battle, you must press that button before deploying anything, and give confirmation to do so.

And yes, anyone who is able to view the war will see that you boosted the army by seeing the blue levels.