Thousands of Canadians gathered here on Sunday to commemorate the sacrifices made by thousands of Canadians who fought during the Battle of the Atlantic - the longest, largest, and most complex campaign of the World War II.

The national commemoration held at the National War Memorial here was attended by Governor General and Commander-in-Chief of Canada David Johnston and other officials from the Royal Canadian Navy (RCN), the Royal Canadian Air Force, and members of the Merchant Navy. They were accompanied by Sea and Air Cadets, Navy League Cadets, the Royal Canadian Legion Colour Party, local veteran organizations, government officials, the diplomatic community, and the Ottawa Children's Choir.

"The Battle of the Atlantic was among the most significant conflicts of the Second World War. It drew upon all of our resources of strength, ingenuity and perseverance. As governor general and commander-in-chief of Canada, I am honored to have laid a wreath in honor of those who served in the Battle of the Atlantic," said Johnston.

Ceremonies were also held across Canada including Halifax, Esquimalt, Quebec City, and the 24 Naval Reserve Divisions across the country to remember and commemorate these gallant sailors, and airmen who did so much to keep the lifeline with Britain going during the World War II.

Each year on the first Sunday in May, Canada holds national commemoration in Ottawa to mark those lost at sea in the longest single campaign of the World War II.