This Widerstandsnest (independent infantry strongpoint) was part of the German Atlantic Wall (Atlantikwall).
The Germans soon realized the importance of the dominating heights of the Mont de Sombre. In 1941 Widerstandsnest 21 is established here, initially for artillery observation purposes. The Vf observation bunker on the northeastern part of the plateau would be in permanent contact with the R120 artillery observation bunker to the southwest (Widerstandsnest 129 "Kiel").
In 1943 the strongpoint was, in fact, called Stützpunkt 131-133 "Kiel" and comprised both the northeastern and the southwestern parts of the plateau. It was also in 1943 that the strongpoint assumed its important command function, becoming a battalion headquarters. The strongpoint was commanded by Feldwebel Hackenberg.
In 1944 the former became Widerstandsnest 128 "Flensburg", while the latter became Widerstandsnest 129 "Kiel". "Flensburg" lost its important command function, now assumed by Widerstandsnest 147 "Honnef" further south, as was relegated to serving as the command post for a company of the 182. Reservedivision. However, the command function is still clear from the presence of a command R501, an R658 water bunker and a communications bunker.
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