Tannenberg is the German name for the formerly East Prussian, now Polish, city of Olsztynek[?]. It is still widely known by its German name due to two famous battles fought in its vicinity, in 1410 and 1914.
... also organized a new London HQ for the Forces Françaises de l'Intérieur (FFI or French Forces for the Interior) under command of general Marie Pierre Koenig[?]. It also ...