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In military tactics, a reduction is accomplished when an encircling force conducts successful offensive operations over an invested force. The "reduction" refers to the shrinking in size of the pocket of territory occupied by the invested force, which would appear to be reduced as seen from a map. It is one of the four possible outcomes of investment, the others being relief, surrender or a breakout ==Overview== The general objective of encirclement maneuvers is to effect an enemy surrender or a reduction of the enemy force. It is generally preferred that an enemy surrender as this entails the least risk of casualties to the victorious party.〔Kecskemeti, Paul (1957) Strategic surrender: The politics of victory and defeat. US Airforce Project Rand.〕〔Army Field Manual FM 3-90 (Tactics) p. D-0〕 There are, however, some exceptions. For example, British General Shute during the battle of the Somme: I'm going to tell you this much, you know what you have got to do, the more prisoners you take, the less food you'll get, because we have to feed them out of your rations!〔Hart, Peter (2012) The Somme: The darkest hour on the Western Front〕 Nevertheless, the decision to reduce an encirclement may be made for a number of reasons. For example: * The encircled force cannot be expected to surrender under any realistic circumstances (e.g., the Münster Rebellion, the Waco Siege, the Siege of Masada). * The encircling force has insufficient resources or supply lines to maintain a prolonged investment (e.g., the Battle of Moscow). * Strategy dictates that the use of the encircling force as a pinning force for a prolonged period is untenable (e.g., numerous encirclements during and following Operation Barbarossa). * Strategy dictates that objectives within the encirclement are too important to allow the enemy to possess for an extended period. (e.g., the Siege of Jerusalem, the Battle of Stalingrad) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Reduction (military)」の詳細全文を読む スポンサード リンク
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