Today is the 70th anniversary of history's biggest amphibious invasion, the D-Day assault on Normandy beaches in World War II.

Men who participated joined world leaders in a day of international commemorations to pay tribute to those who lost their lives. 

President Obama says the heroes who stormed French beaches 70 years ago today changed the course of history and brought down Hitler's brutal regime.  

The President received a warm welcome as he arrived at Sword Beach, one of the main landing areas for allied forces who stormed Normandy.  

He spoke earlier today in Normandy, France, on the anniversary of the major D-Day offensive.  

More than 160,000 allied troops landed on the French coastline in 1944.  

The massive invasion was a critical part of defeating Germany during World War Two.