After his father died, Maria Rosetti married for a second time, to George Enescu (Romania's greatest composer and a world class violinist).

He also played tennis and was the captain of the Romanian ice hockey team at the World Championships in 1931 and 1933.

After the capture of Odessa, the Romanian Army reduced the number of front line troops and he was one of the reservists who were sent home.

On 29 June, he and his wingman engaged four Yakolevs, two La-5s and four Spitfires, while trying to protect three Romanian Ju 88 bombers.

In July he flew both day and night missions, even though his aircraft was not equipped for low-visibility flying.

On 27 July 1943, he shot down the Soviet Air Forces' flying ace Nikolay F. Khimushin (12 kills).

On 15 April, there was a USAAF raid and Cantacuzino and his wingmen attacked the bomber formations and shot down six B-24 Liberators (the prince got one himself).

After 23 August 1944, when Romania quit the Axis, the Luftwaffe started bombing Bucharest from airfields close to the capital which were still in German hands.

Cantacuzino later flew on a special mission: to transport Lieutenant-Colonel James Gunn III, the highest ranking American prisoner-of-war in Romania, to the airbase at Foggia and return to Romania with B-17s converted for transport duty to airlift over 1,000 U.S. POWs in what was to be called Operation Reunion.

While in Italy, Cantacuzino was treated as a guest, and even meeting with the Supreme Allied Commander of the Mediterranean Theater of Operations.

There he was helped by the Romanian community to buy himself an airplane, in order to earn his living at air shows.