World War II Wiki

-

Please log in!
Logging in will provide you with an ad-free website.
It will also give you access to the Monobook skin, which is much easier to use and navigate.

READ MORE

World War II Wiki
Register
Advertisement
World War II Wiki
Battle of Peleliu Map

The map for the assault on Peleliu. D-Day for the operation would be September 15.

In the military, D-Day is the day on which a combat attack or operation is to be initiated. The best known D-Day is June 6, 1944—the day of the Normandy landings—initiating the Western Allied effort to liberate mainland Europe from Nazi occupation during World War II. However, many other invasions and operations had a designated D-Day, both before and after that operation.

The terms D-Day and H-Hour are used for the day and hour on which a combat attack or operation is to be initiated. They designate the day and hour of the operation when the day and hour have not yet been determined, or where secrecy is essential. For a given operation, the same D-Day and H-Hour apply for all units participating in it. When used in combination with numbers, and plus or minus signs, these terms indicate the point of time preceding or following a specific action. Thus, H−3 means three hours before H-Hour, and D+3 means 3 days after D-Day. By extension, H+75 minutes is used for H-Hour plus one hour and fifteen minutes. Planning papers for large-scale operations are made up in detail long before specific dates are set. Thus, orders are issued for the various steps to be carried out on the D-Day or H-Hour minus or plus a certain number of days, hours, or minutes. At the appropriate time, a subsequent order is issued that states the actual day and times.

Other days such as A-Day (Battle of Leyte Gulf), L-Day (Battle of Okinawa) etc. have different meanings for the military.

Advertisement