1. In the interface of training soldiers, tapping the “↑” sign and you can upgrade the soldiers you want.
2. You cannot choose the target level when you upgrade your soldiers, you can only upgrade soldier to the unit of the highest level that you’ve unlocked. (For example, if you’ve unlocked T12 Cavalry, when you upgrade your Cavalry, you can only upgrade them to T12 Cavalry, and you cannot upgrade them to T11 Cavalry or T10 Cavalry)
Tips:
If you received the notice of “Failed to connect internet” when you are upgrading your soldiers, please recall all your troops outside the castle. This notification comes out because the soldiers in your castle are less than the number of soldiers you choose to upgrade.
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Game Guide for Clash of Kings