Statistics for occurrence #1 of “Morris islands” in chapter 2 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1, Condensed history of regiments.:

...r at Hilton Head; here it remained for some months, engaging in picket and patrol duty, with a reconnoissance Oct. 22, 1862, to Pocotaligo, S. C.; and in June, 1863, a detachment on duty at Folly and Morris islands took part in the siege of Fort Sumter. On Aug. 4, 1863, the battalion was permanently detached from the 1st Cavalry and called the Independent Battalion, Mass. Cavalry Vols., and engaged in the exp...
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