12 Jun, 1941
HrMs O 24 (Lt.Cdr. O. de Booy) sinks the Italian tanker Fianona (6600 GRT) off Vada, Toscana, Italy in position 43º08'N, 10º30'E with torpedoes and gunfire.

O 24 also sinks the Italian auxiliary patrol vessel V 121 / Carloforte (143 GRT) with gunfire and scuttling charges 36 nautical miles north-west of Gorgona in position 43º45'N 09º20'E. (see map)

17 Jun, 1941
While on patrol in the La Spezia area HrMs O 24 (Lt.Cdr. O. de Booy) fires torpedoes at an unidentified Italian tanker, the torpedoes however miss the target.

6 Aug, 1941
HrMs O 24 (Lt.Cdr. O. de Booy) torpedoes and sinks the Italian merchant Bombardiere (613 GRT) off Cape di Fregene, Italy in position 41º47'N, 12º06'E. (see map)

7 Aug, 1941
HrMs O 24 (Lt.Cdr. O. de Booy) sinks the Italian sailing vessel Margherita Madre (296 GRT) with gunfire off Anzio, Italy in position 41º23'N, 12º28'E. (see map)

12 Aug, 1941
While on patrol in the Ligurian Sea HrMs O 24 (Lt.Cdr. O. de Booy) attacks an Italian sailing vessel with a torpedo. The torpedo however misses its target.

6 Sep, 1941
HrMs O 24 (Lt.Cdr. O. de Booy) sinks the Italian fishing vessel V 63 / Carla (347 GRT) with gunfire about 30 nautical miles bearing 293 from Gorgona Island, Italy in position 43º45'N, 09º21'E. O 24 first fired a torpedo but missed. (see map)

9 Sep, 1941
HrMs O 24 (Lt.Cdr. O. de Booy) torpedoes and sinks the Italian merchant Italo Balbo (5114 GRT) about 10 nautical miles west of Elba Island, Italy in position 42º47'N, 09º57'E. (see map)

21 Feb, 1943
HrMs O 24 (Lt.Cdr. W.J. de Vries) sinks the Japanese coaster Bandai Maru (165 GRT) with gunfire west of Phuket Island in position 07º50'N, 98º09'E. (see map)

20 Aug, 1943
HrMs O 24 (Lt.Cdr. W.J. de Vries) torpedoes and sinks the Japanese auxiliary gunboat Chosa Maru (2538 GRT) 8 nautical miles south-west of Penang, Malaya in position 05º09'N, 100º10'E. (see map)