Recruits from the Pittsburgh area and Allegheny County organized at Camp Copeland from September 2–19, 1862 into the 155th Regiment Pennsylvania Volunteer Infantry.
Another regiment in the brigade, the 146th New York Volunteer Infantry, had already been issued their Zouave uniform in June 1863.
Slight variations in jacket styles can be seen in the unit's regimental history entitled "Under the Maltese Cross" published in 1910.
Colonel and Brevet Brigadier General Alfred L. Pearson, commander of the regiment at the Battle of Lewis's Farm on March 29, 1865, was awarded the Medal of Honor on September 17, 1897, for his actions leading a counterattack which regained lost ground and repulsed the Confederates, driving them back to their original positions.
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