A reduit is a fortified structure such as a citadel or a keep into which the defending troops can retreat when the outer defences are breached.[1] The term is also used to describe an area of a country that, through a ring of heavy fortifications or through enhancing through fortification the defences offered by natural features such as mountains, will be defended even when the rest of the country is occupied by a hostile power.[2]
^Oxford English Dictionary, reduit "2. A keep or stronghold into which a garrison may retreat if the outworks are taken, thereby prolonging the defence of the place".
^"reduit, n.". Oxford English Dictionary (Third ed.). Oxford University Press. November 2010 [September 2009]. Retrieved 3 March 2011.. An entry for this word was first included in New English Dictionary, 1904.
1948 Times 31 Dec. 3/3 "The obsolete conception of a national reduit has been abandoned in favour of an extra-territorial base established in the Belgian Congo".
2003 Macpherson Amer. Intelligence War-time London vi. 177 "As for the Reduit (or Redoubt), this was the rumoured area for 'a last-ditch stand' in the Bavarian, Austrian and Italian Alps".