French navy refers to the specific navy of France.

Navy may refer to any countries navy.

Old Navy

J. Fenimore Cooper has written:

'The history of the navy of the United States of America'

'History of the navy of the United States of America from 1815 to 1853'

'History of the navy of the United States of America'

'The history of the navy of the United States of America'

'The history of the navy of the United States of America'

...French... Navy?

how the french navy helped George Wahinggton at yorktown was the french sent 5,000 soilders to aid the US