Tactics

With a survey of the area, you know how it can be used to ambush. There are tell-tale signs and indications you may pick up on if danger is imminent. You also recognize good spots for traps or enclosure points for aiding an army.

In any setting, you have a deep knowledge of successful strategies from the campaigns past, can identify weaknesses in an enemy's approach, and know how to safeguard your own supply lines.