[citation needed] The class was as part of a program to build four mine warfare ships during the Second World War.

Two (Murature and King) were completed as patrol ships and the others (Piedrabuena and Azopardo) as antisubmarine frigates.

In 1955 both took part of the rising against Juan Domingo Perón's government known as Revolución Libertadora, when she protected as a floating battery the rebel naval base at Río Santiago and was strafed by loyal Gloster Meteor jet fighters.

According to Capitán de navio (R) Benjamín Cosentino who acted as anti-submarine advisor to the Officer in Tactical Command, Argentine Destroyer Force in February 1960, he was sent to the School of Naval Warfare that month to write the final report on the 1960 Golfo Nuevo incident for the Argentine Naval General Staff.

In this incident, one or possibly two intruder submarines of unknown flag were present in Golfo Nuevo, Chubut Province, between the period 31 January and 17 February 1960 and eluded or survived all attempts to sink them.