 On 21 December, the boat's mines claimed three auxiliary submarine chasers, a German merchant ship, and a minesweeper.Throughout the war, "Rubis" made 22 operational patrols, laying nearly 683 mines and sinking some 21,000 GRT of shipping.With 22 ships sunk (14 of them German, including 12 warships), "Rubis" achieved the highest kill number in the FNFL.