Initially built on Romanian order , they were completed for the French Navy and commissioned in 1921 .
The first submarines completed by France after World War I were the three boats of the O'Byrne class ( O'Byrne , Henri Fournier and Louis Dupetit - Thouars ) .
Initially built on Romanian order , France were completed for the French Navy and commissioned in 1921 .
The first submarines completed by France after World War I were the three boats of the O'Byrne class ( O'Byrne , Henri Fournier and Louis Dupetit - Thouars ) .