They just asked to go over to film a documentary on foreign diseases during war times, and they let them.
they spied on their enemy
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.
The FBI and Army and Navy counterintelligence agents and OSS agents spied on the spies to prevent them from gathering info
To break through the enemy lines
The World War I zeppelins were large blimps used to gain information from over enemy lines, but were slow and easy targets for artillery guns.
they spied on their enemy
None. All German spies were captured before they had a chance to start operating.
Spies were utilized by many nations to gather intelligence against the enemy.
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.
Not quite sure of the question? But, all sides in the world wars had spies reporting back important information of an enemy's activities, from deep within the enemies camp.
The British World War II organisation that did daring missions behind enemy lines was Chindits. Chindits were specially trained military soldiers that were deployed deep behind enemy lines during WWII.
The FBI and Army and Navy counterintelligence agents and OSS agents spied on the spies to prevent them from gathering info
During World War 1, there were hundreds of German spies who were caught in the United Kingdom. They were all killed upon captivity.
Break thru's, breaking enemy lines, disrupting rear based enemy supply lines (called deep battle); and supporting infantrymen when needed.
The tank.
Yes, they helped the war effort by arresting enemy spies, tracking escaped prisoners, and helping protect Canada's coast from submarines. (If your asking if they fought in the World Wars, then No)
it made it easier for the other team to know what there doing