What is D-Day (military term)?
[[File:Into the Jaws of Death 23-0455M edit.jpg|thumb|Soldiers of the 16th infantry regiment land at [[Omaha Beach]], one of the five sectors for Operation Overlord|alt=Soldiers in a landing craft]] '''D-Day''' is a term used in [[military]] planning to mean the actual day a major operation or event is to begin. The days leading up to a D-Day are called D-1, D-2, D-3, etc. That allows scheduling a sequence of events before the start date is chosen. The days after a D-Day are D+1, D+2, D+3, and so on.<ref>{{Cite book|url=https://www.worldcat.org/oclc/28853279|title=War, peace, and all that jazz|last=Hakim|first=Joy|date=1995|isbn=0-19-507761-X|location=New York|oclc=28853279}}</ref> Several different days in [[military history]] were named D-Day. However, the most famous D-Day was the [[Normandy landings]] during [[Operation Overlord]], on the morning of June 6, 1944, when the largest naval attack in military history took place in [[France]] during [[World War II]]. Operation Overlord was led by US General [[Dwight Eisenhower|Dwight D. Eisenhower]] The [[Allies of World War II|Allies]] Britain, [[Canada]], and America breached the Normandy coastline and broke through the German fortification chain, the [[Atlantic Wall]]. That was a turning point in World War II though over 3,500 men were lost. The invasion started with airborne landings at 3:30 a.m. and the seaborne invasion started at 6:30 a.m. and took 19 hours. Operation Overlord had been planned for months and was scheduled for June 5 but was delayed for a day by bad weather. Over the next several months, the Allies fought in France and took various useful ports such as [[Caen]] and later took [[Paris]]. After less than a year, the Allies entered [[Nazi Germany]], which surrendered.<ref>{{Cite book|url=https://www.worldcat.org/oclc/61175901|title=The Oxford companion to World War II|date=2005|publisher=Oxford University Press|isbn=0-19-280666-1|edition=New|location=Oxford|oclc=61175901}}</ref> An invasion of southern France was intended to start a