hit the beach, and be stuck with a tide going out, causing more damage, and jamming up the beach with wrecked ships that were in the way.

Once initial foothold was gained, the troops came in around the clock.

Pre-assault fires had mixed effect...mainly because US Army Air Force (there was not separate Air Force at the time) couldn't/wouldn't get through the clouds and had less effective sites....the less-effective pre-assault fires had devastating effects on the initial waves at Omaha and other locations.