It is called an amphibious assult.
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A sudden attack is known either as a 'surprise attack' or an 'ambush.' Although both are unexpected, a surprise attack is typically a land offensive (the German Offensive @ Battle of the Bulge), whereas in an ambush a patrol or unit is fired on by defenders in a concealed position.
d-day, during WWII
A concerted attack by land sea and air.
The Germans exhausted their forces in a major attack
A land is called a fief in the Middle Ages.