The Battle of France began when German ground forces advanced into France, the Netherlands, Belgium, and Luxembourg on 10 May 1940. Italy declared war on France on 10 June 1940 and joined the invasion. La Vestale was among nine submarines scheduled to depart Toulon on 18 June 1940 bound for French North Africa, but the departure never took place and all nine submarines remained at Toulon.[5]
The Battle of France ended in France's defeat and armisticeswith Germany on 22 June and with Italy on 24 June, both of which went into effect on 25 June 1940. On that day, La Vestale was at Toulon.
Vichy France
After the June 1940 armistice, La Vestale served in the naval forces of Vichy France. On 9 December 1940, the 17th Submarine Division — now reduced to La Vestale, Aréthuse, and La Sultane — departed Toulon in company with the submarine Archimède and the Élan-classsloop-of-warCommandant Bory bound for Casablanca in French Morocco, which they reached on 16 December.[6][7] From Casablanca, the 17th Submarine Division proceeded to Dakar in Senegal.[2]Atalante later joined them there and again became part of the division.[5]
While operating from Dakar, La Vestale and Atalante both sustained diesel engine damage that could not be repaired in French West Africa.[5] The two submarines departed Dakar on 22 August 1941 bound for southern French Morocco, where Atalante called at Agadir from 23 to 29 August 1941 before rendezvousing with La Vestale at Safi on 30 August.[5] The two submarines arrived at Casablanca on 31 August 1941.[5]
On 4 March 1942, the four submarines of the 17th Submarine Division departed Casablanca bound for Toulon, where they were to undergo streamlining.[6] Along the way, La Vestale called at Oran in Algeria in April 1942.[2] With the work completed on all four of its submarines, the 17th Submarine Division departed Toulon on 30 September 1942 to return to Casablanca.[6]
La Vestale is recorded as having been at sea in the Atlantic on 1 November 1942 during a voyage from Casablanca to Dakar in company with Aréthuse, Atalante, and La Sultane.[2]
After the cessation of hostilities between Allied and French forces in French North Africa, French forces in Africa, including La Vestale, joined the forces of Free France. La Vestale became a unit of the Free French Naval Forces.
On 18 May 1943, La Vestale departed Oran for Algiers in Algeria with a convoy made up of the French fleet tankerDrôme,a British minesweeper, and three small British patrol boats.[2] Some time later, Drôme, escorted by one of the patrol boats, detached from the convoy to proceed separately to Ténès, Algeria.[2] At 17:00, the minesweeper reported damage and was left behind.[2] During the predawn hours of 19 May 1943, the British destroyerHMS Wishart approached La Vestale and, mistaking her for a German U-boat, attacked her.[2]La Vestale sustained massive damage to her stern and suffered one man killed and several wounded.[2] She was towed to port, where it was decided to repair her using parts from La Sultane or from a refloated submarine.[2]
In November 1943, La Vestale was at Oran and still was part the 17th Submarine Division along with Aréthuse, Atalante, and La Sultane.[2] In 1944, she was one of five French second-class submarines still operational, along with Amazone, Curie, Doris, and La Sultane.[2] In August 1945, when World War II ended with the surrender of Japan, she was part of the Oran Submarine Group, waiting to be placed in reserve.[2]
On 14 August 1946, La Vestale was stricken[4] from the navy list and sold for scrapping.[2]
