From the very first days of WWII, Germany and the Allies fought
at sea. The control of the ocean routes that carried all kinds of
supplies to Great Britain soon became one of the war's key issues:
for six years, a desperate battle is fought in the Atlantic, as
Allied navies try to protect merchant ships against Germany's formidable
U-boats.
When France falls, Great Britain calls upon Canada; the Royal Canadian
Navy undertakes a dramatic effort to increase its strength and efficiency.
Within six years, it will become one of the world's most powerful
navies.