I have a cover mailed from Herzogenbuchsee Switzerland to Erlangen Germany (Bavaria) in 1916. It was censored and the tape carries the inscription "Militarischerseits unter Kriegsrecht Geoffnet".
Some time ago I had written "opened under martial law" on it's glassine but when I googled it this time it appears it may be a return to sender marking.
It appears to be rather common and why I can't seem to find a translation is a bit curious, or perhaps my internet skills are decreasing.
