How to replenish stamina fast?

McCarty's second troop skill will reduce the stamina cost of sending your troops for a lair rally for example. But only by a small amount. It will save some stamina but not make it recover faster.

In the Research Center under the Development tree there are 2 items to research called Stamina Replenishment. These will speed it up a little.

In the Commanders Talents under the Balance Tree you will also find 2 items that boost stamina recover.

The other way to regain stamina quickly is to use the stamina items that you can buy or sometimes get as rewards from events.