Abwehrlinie

The Abwehrlinie, also known as the "opposition line" or "counter-intelligence line", was a series of lines and supply routes established by the German military in occupied Europe during World War II. The purpose of the Abwehrlinie was to provide a secure means of communication and supply between German military units and rear echelons, while evading detection by Allied intelligence and local resistance groups.

Running east to west, the Abwehrlinie generally followed the path of the enemy's advance line during the invasion of Poland in September 1939. Over time, the line evolved to accommodate the changing circumstances of the war, but its fundamental purpose remained the same. The Abwehrlinie was used by German intelligence and special forces units to coordinate operations, transmit vital information, and supply troops with critical resources.

To protect the Abwehrlinie from enemy interception, the German military employed a range of counter-intelligence techniques. These included encrypting communications, using secure radios and telephones, and concealing key assets and personnel along the supply line. Despite these efforts, the Allies were able to intercept and disrupt several stretches of the Abwehrlinie, using techniques such as signal intelligence and sabotage.

The Abwehrlinie is often studied as an example of the German military's efforts to maintain operational security during World War II. The successes and failures of the Abwehrlinie have been the subject of extensive research and analysis by military historians and intelligence specialists.