Forestieri took part in the Spanish Civil War and served in the VI Gruppo.

On 8 June 1938, over Lucena del Cid, Sottotenente Elia Mussolin claimed a Curtiss individually and a Rata in collaboration with Tenente Forestieri. On this occasion Mussolin also claimed a damaged Curtiss.

Baccara ended the war Spanish Civil War with 1 shared biplane victory.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1938
	08/06/38		1/2	I-16	Shared destroyed	Fiat CR.32		Lucena del Cid	VI Gruppo

Biplane victories: 1 shared destroyed.
TOTAL: 1 shared destroyed.

Sources:
Aerial War in Spain: Chronicle of air battle 1936-1939 – Sergey Abrosov, 2008
Air War over Spain - Jesus Salas Larrazabal, 1974 Ian Allan Ltd, Shepperton, Surrey, ISBN 0-7110-0521-4
Fiat CR.32 Aces of the Spanish Civil War - Alfredo Logoluso, 2010 Osprey Publishing, Oxford, ISBN 978-1-84603-983-6
I Cavalieri Erranti - Ludovico Slongo, Stefan Lazzaro, Eugenio Eusebi, Michele Palermo and Danilo Ventura, 2023, ISBN 978-88-87952-37-7
Polikarpov I-15, I-16 and I-153 Aces - Mikhail Maslov, 2010 Osprey Publishing, Oxford, ISBN 978-1-84603-981-2
Soviet airmen in the Spanish civil war 1936-1939 - Paul Whelan, 2014 Schiffer Publishing Ltd, ISBN 978-0-7643-0
Spanish Republican Aces – Rafael A. Permuy López, 2012 Osprey Publishing, Oxford, ISBN 978-1-84908-668-4