observation post

noun Military.
  1. a forward position, often on high ground, from which enemy activity can be observed and, particularly, from which artillery or mortar fire can be directed.
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British Dictionary definitions for observation post

observation post

noun
  1. military a position from which observations can be made or from which fire can be directedAbbreviation: OP
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012