there were 3 parts of the battle. There was the attack, the first wave, and the second wave.
In the attack, the Allies needed to invade when there was a full moon for light, so they only had a small duration to invade. General Eisenhower agreed to attack, despite overcast skies. The weather affected the Allies ability to attack, but it made the germans more surprised and unprepared. The Allies attacked during high tide to avoid obstacles germans had put in the water.
in the first wave, it all started with paratroopers, or men who jumped out of planes using parachutes. They usually jumped at night and landed behind enemy lines. Their job was to destroy key targets and capture bridges in order for the main invasion force to land on the beaches of Normandy, France. Thousands of dummy soldiers were dropped in order to draw fire and confuse the enemy.
In the second wave, thousands of planes dropped bombs on German defenses. Warships started to bomb the beaches from the water. At the same time, underground members of the French resistance sabotaged the Germans. They cut telephone lines and destroyed railroads. The main invasion forces of over 6000 ships carrying troops, weapons, tanks, and equipment approached the beaches of Normandy. The Americans landed at Omaha and Utah beaches. The Omaha beach landing resulted in a fierce fighting and many US soldiers losing their lives, but they were finally able to take the beach. The Utah landing proved successful. In the end, over 150,000 troops landed in Normandy by the end of D-day. They were able to push their way inland, allowing more troops to land in France over the next several days. Over half 1 million Allied troops arrived in France by June 17 and began pushing the Germans out.