Despite their divergent backgrounds, the 29th Massachusetts and the rest of the brigade fought well together, earning applauds for hard campaigning during the Seven Days Battles; most notably at
Savage's Station, Glendale, and Malvern Hill. Malvern Hill, the Army of the Potomac languished at Harrison's Landing on the Peninsula and Meagher gained permission to recruit in New York to replenish the brigade's losses. While other units were transferred to northern Virginia during the summer of 1862 to fight under Gen. John Pope, the Irish Brigade remained on the Peninsula with Gen. George B. McClellan.