Coup d'œil (or coup d'oeil; ) is a term taken from French, that more or less corresponds to the words glimpse or glance in English. The literal meaning is "stroke of [the] eye". It is mostly used (in English) in a military context, where the coup d'œil refers to the ability to discern at one glance the tactical (dis)advantages of the terrain. For example, the famous king Frederick the Great of Prussia in his 1753 "Particular Instructions" devotes special attention to the military coup d'œil, defining it as: The phrase popularly comes from Clausewitz: Napoleon remarked upon it: