Combat intelligence is knowing everything possible about the enemy, the weather, and the terrain.
Combat intelligence is indispensable for the planning and conducting of operations in one's own area.
Counterintelligence is the plans and actions carried out in order to prevent the enemy from finding out about one's plans, intentions, and forthcoming activities.
There are two types of information:
1) positive information, which refers to activities taking place in a given area at the moment of observation and
2) negative information, which refers to activities taking place in a given area routinely, but not at the moment of observation.
Five sources for gathering information about the enemy.
Enemy soldiers and line crossers
Captured equipment
Captured documents
Enemy activities
Local populace
Two types of intelligence reports:
Oral reports, which are faster than written ones and make it possible to ask questions and immediately receive answers for them.
Written reports, which can be delivered in exactly the same form in which they were prepared.