Through surprise attack the United States seeks to neutralize other side's military equipment and expand the operation theatre.

In 1950 it instigated south Korea to launch a surprise attack on the DPRK at dawn on a Sunday. But the Korean war brought about the beginning of a downhill turn for U.S. imperialism.

The U.S. imperialists, availing themselves of Grenada's complicated situation, attacked the country suddenly on the early morning of October 25, 1983, and occupied it.

They employed the same method on December 20, 1989 to invade Panama.

The Key Resolve and Foal Eagle military maneuvers started by the United States with south Korea are a product of their anti-DPRK policy and part of their preparations for another Korean war.