Short answers, pulled from the story.
Omaha Beach was one of five Allied beach landing sectors during the amphibious assault component of Operation Overlord on the 6th of June 1944. The Allies invaded German-occupied France with the Normandy landings to secure a continuous lodgement on the Normandy coast of the Baie de Seine.
The untested American 29th Infantry Division assaulted the western half of the beach alongside nine companies of U.S. Army Rangers redirected from Pointe du Hoc. The battle-hardened 1st Infantry Division was given the eastern half.
American forces suffered 2,400 casualties at Omaha on June 6 but by end day landed 34,000 troops. German 352nd Division lost 10 percent strength with 1,200 casualties no reserves coming continue fight.
The area that became Omaha was originally designated X-Ray before changing on the 3rd of March 1944. Four lines of obstacles were constructed in the intertidal zone to defend against the Allied invasion.
Rear Admiral John L. Hall strongly disapproved of what he considered to be the small amount of air and naval bombardment used saying it was a crime to send men on the biggest amphibious attack in history with such inadequate support. At 05:50 the planned naval bombardment began involving battleships destroyers and heavy bombers.