Depending on whether you are looking for academic analysis, historical accounts, or stationery advice, several "papers" and resources are related to "Enemy Lines."
To help me find or draft the specific type of paper you need, could you clarify if you are: Writing an or film critique ? Looking for historical documents or primary sources? Researching stationery and ink compatibility? Enemy Lines
: The article Brothers across Enemy Lines documents the letters between a mission president and a German soldier during World War I. Depending on whether you are looking for academic
: Data from Behind Enemy Lines: How Russia May have Used Twitter to Seize Crimea discusses how modern social media data is used as a new frontier for military planning and "information warfare". : The article Brothers across Enemy Lines documents
For those interested in historical records and first-hand accounts on paper: