During her service in the Argentine Navy, she participated in the 1955 Revolución Libertadora, when she shelled oil depots and military facilities in the city of Mar del Plata, along with a flotilla of destroyers, on 19 September 1955.

She was accidentally rammed by her sister General Belgrano (former USS Phoenix) during an exercise on 15 March 1956, which resulted in damage to both cruisers.

[1] Nueve de Julio was withdrawn from active service in May 1971 and spent her last years moored at the Puerto Belgrano Naval Base.

A number of cabins were converted into cells in which disappeared persons were temporarily held for periods ranging from days to months, while torture sessions took place at the headquarters of the Naval Establishments Police.

[3] Nueve de Julio was struck on 31 October 1977 and sold on 28 June 1981, with the manifesto stating that she was to be moored at Brownsville, Texas and converted into a museum ship.