An army of observation is a military body whose purpose is to monitor a given area or enemy body in preparation for possible hostilities. Some of the more notable armies of observation include: * Third Reserve Army of Observation, a Russian army tasked to monitor the Austrian border in 1811 prior to the

French invasion of Russia The French invasion of Russia, also known as the Russian campaign, the Second Polish War, the Army of Twenty nations, and the Patriotic War of 1812 was launched by Napoleon Bonaparte to force the Russian Empire back into the continental block ...

*The army of observation at

Fort Jesup Fort Jesup, also known as Fort Jesup State Historic Site or Fort Jesup or Fort Jesup State Monument, was built in 1822, west of Natchitoches, Louisiana, to protect the United States border with New Spain and to return order to the Neutral Strip. ...

, Louisiana, United States, which monitored Texas' transition from Spanish to Mexican control, and to eventual independence *The Hanoverian Army of Observation which monitored the border prior to the French Invasion of Hanover in 1757

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{{Set index article Army units and formations