United States Army Rangers
In between Omaha and Utah beaches in Normandy lies a promontory called Pointe du Hoc. Prior to D-Day on 6 June 1944, the Germans had six 155mm artillery pieces that could effectively fire on either Omaha or Utah beaches. Pointe du Hoc (typo'ed as Pointe du Hoe on many D-Day documents and maps) was target number one for the Americans to neutralize.
Feeling the pointe was unassailable from the sea, the Germans focussed most of the defenses facing rearward. The Americans, knowing this, sent their elite infantrymen, Companies D, E & F of the 2nd Ranger Batallion, to scale the seaside 100 foot vertical walls of the pointe in an attempt to surprise the Germans.
The pointe was subjected to an unprecedented aerial and naval bombardment prior to the invasion. You can see the effects of this in the giant craters that still exist here today. The firing lifted just before the Rangers were to land at 06:30. This is where things begian to go wrong.