They used disguises of the enemy, as in...
American Spies wear German Clothing
Itailan Spies wear French Clothing
Spies in World War 2 were more like "moles" than spies.
A "mole" is like a spy, but they work for both sides, but provide info and really work for only one side.
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Here are some links to websites that have photos and descriptions of them!
no only to track resistance fighters and escaped POW's
The would use guile ( sweetness ) to get the information they needed.
TNT ( it's DYNAMITE!!)
In general, scouts determine the current disposition and movement of enemy troops, spies infiltrate enemy lines and use every possible means to gather useful information.