Pietro Secchi was from Gambarano (Pavia).

In November 1940, Sergente Secchi served in the 365^a Squadriglia, 150^o Gruppo C.T. This unit was at the time equipped with Fiat CR.42s.

On 2 November, five Junkers Ju 87R Stukas from the 96^o Gruppo Ba'T attacked Yanina. The town was also raided by ten Cant Z.1007bis from the 47^o Stormo.
Yanina was the main base from which the Greek forces were now launching their counter-attacks against the Italian forces, and three PZLs of 21 Mira had been detached here for defense. These were scrambled after an attack on Larissa, led by Hiposminagos John Sakellariou. The interception took place over Mitsikeli Mountain, close to Yanina, but during the fight, Sakellariou was shot down and killed as he attacked one bomber. He was credited with having shot down two others before he fell, although it seems that none of the Italian units sustained any losses. Episminias Christos Papadopulos was also shot down and killed in his P.24 according to Greek sources.
Although not mentioned in the Greek account of this raid, escorting CR.42s were present over Yanina and Capitano Giorgio Graffer's 365^a Squadriglia engaged three PZLs. Capitano Graffer, Sottotenente Lorenzo Clerici, Sergente Bruno Zotti and Sergente Secchi claimed the three PZL shared shot down.

After the end of the Greek campaign, the 150^o Gruppo remained in the area and took part in counter-insurgency operations against Montenegrin partisans.
Meanwhile, throughout July 1941, the Gruppo's pilots continued to ferry captured Yugoslav aircraft to Italy. On 16 July a Breguet XIX that was being flown from Niksic to Tirana force-landed due to engine failure. Its pilot, Sergente Secchi of the 365^a Squadriglia, was captured by Montenegrin rebels.

On 6 October 1942, the 150^o Gruppo scrambled a number of MC.200s. Four pilots from 364^a Squadriglia claimed a P-40 as jointly shot down. Claiming pilots were Sottotenente Ettore Caregnato, Sottotenente Bruno Serotini, Maresciallo Walter Bertocci and Sergente Maggiore Secchi.

Secchi ended the war with 3 shared biplane victories and a total of 4 shared victories.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1940
	02/11/40		1/4	PZL P.24 (a)	Shared destroyed	Fiat CR.42		Yanina area	365a Squadriglia
	02/11/40		1/4	PZL P.24 (a)	Shared destroyed	Fiat CR.42		Yanina area	365a Squadriglia
	02/11/40		1/4	PZL P.24 (a)	Shared destroyed	Fiat CR.42		Yanina area	365a Squadriglia
	1942
	06/10/42		1/4	P-40	Shared destroyed	MC.200		North Africa	364a Squadriglia

Biplane victories: 3 shared destroyed.
TOTAL: 4 shared destroyed.
(a) Claimed in combat with PZL P.24s from 21 Mira which lost two pilots KIA while the 365^a Squadriglia claimed three.

Sources:
53^o Stormo - Marco Mattioli, 2010 Osprey Publishing, Oxford, ISBN 978-1-84603-977-5
A History of the Mediterranean Air War 1940-1945: Volume Two – Christopher Shores and Giovanni Massimello with Russell Guest, Frank Olynyk & Winfried Bock, 2012 Grub Street, London, ISBN-13: 9781909166127
Air war for Yugoslavia, Greece and Crete - Christopher Shores, Brian Cull and Nicola Malizia, 1987 Grub Street, London, ISBN 0-948817-07-0
Elenco Nominativo dei Militari dell' A. M. Decorati al V. M. Durante it Periodo 1929 - 1945 2 Volume M - Z
Fiat CR.42 Aces of World War 2 - Håkan Gustavsson and Ludovico Slongo, 2009 Osprey Publishing, Oxford, ISBN 978-1-84603-427-5