PAPER BOMBS

leaflets are the orinance of psychological warfare, the purpose of which is to instill paralytic fear that will severely reduce an enemy's fighting capabilities.
Leafleting is the art of artlessness.
I think leaflets with texts and illustrates are powerful.

These are  
COMMUNIST NORTH KOREA WAR LEAFLETS

Leaflets are a means of communicating directly with with the enemy. They are usually disseminated by air using aeroplanes, balloons, leaflet bombs, shells or rockets. Their purpose is to influence the enemy's thinking and persuade him to take action, ultimately to give up fighting. They were extensively used in all wars of the 20th C and are still being used today, currently by the Americans in Iraq.