First, before any combat, the game checks to make sure one of the players has this trait and a high enough wisdom. If so, the players enter a tactics map.
As you can see, the map gives details about some of the enemies. It also includes a Help button.
Walking over this button triggers a Help dialog, so players who don't read my blog will know what is going on.
Finally, the player chooses one of the red squares to arrange his/her starting forces. In lots of encounters, this can give a huge advantage. The battle begins as soon as the player enters one of these squares.