point duty

noun
  1. the stationing of a policeman or traffic warden at a road junction to control and direct traffic
  2. the position at the head of a military patrol, regarded as being the most dangerous
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

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Historical Examples of point duty