Eichsfeld is a district in Thuringia, Germany, and part of the historical region of Eichsfeld. It is bounded by the districts of Nordhausen, Kyffhäuserkreis and Unstrut-Hainich-Kreis, and by the states of Hesse and Lower Saxony. From Wikipedia
The operation targets a cell around Heinrich XIII. Prinz Reuß suspected of carrying out shooting exercises to prepare a possible attack on the Bundestag.