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During World War II, there were two operations named Neptune:
1. Operation Neptune referred to the initial phase of the Allied invasion of Normandy, Operation Overlord.
Although many references state that Operation Neptune refers to naval operations in support of Operation Overlord, the most reliable references make it clear that Overlord refers to the establishment of a large-scale lodgement in Normandy, and that Neptune refers to the landing phase; i.e. Neptune was the first part of Overlord. According to the :
See Battle of Normandy.
See also for further support of this usage.
2. Neptun was the German counterattack by German ground forces against Soviet units near the Black Sea at Myschanko-Berg on 6 April, 1943. Part of the Battle of Stalingrad.
Operation Neptune is also a computer game produced by The Learning Company which was designed to teach children about basic mathematics. The gameplay had players control a submarine, called the Neptune, as it navigated through various parts of the ocean, while solving math problems in order to proceed, and picking up pieces of the "Galaxy space capsule" which crash-landed while being sent back to Earth from a team of astronauts and scientists on a top-secret research mission in deep space.