Brutus de Villeroi (1794–1874) was a French engineer of the 19th century, born Brutus Amédée Villeroi (he added the aristocratic "de" in his later years) in the city of Tours and soon moved to Nantes, who developed some of the first operational submarines, and the first submarine of the United States Navy, the Alligator in 1862.
The United States Navy only had one operational submarine in 1863. It was called the Alligator.
Brutus de Villeroi (1794–1874) was a French engineer of the 19th century, born Brutus Amédée Villeroi (he added the aristocratic "de" in his later years) in the city of Tours and soon moved to Nantes, who developed some of the first operational submarines, and the first submarine of the United States Navy, the Alligator in 1862.

Can we draw the following conclusion?
The United States Navy only had one operational submarine in 1863. It was called the Alligator.

Options: 

 - yes

 - it is not possible to tell

 - no
it is not possible to tell
Brutus de Villeroi (1794–1874) was a French engineer of the 19th century, born Brutus Amédée Villeroi (he added the aristocratic "de" in his later years) in the city of Tours and soon moved to Nantes, who developed some of the first operational submarines, and the first submarine of the United States Navy, the Alligator in 1862.

Can we draw the following conclusion?
The United States Navy only had one operational submarine in 1863. It was called the Alligator.

Options: 

 - yes

 - it is not possible to tell

 - no
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