5Barry, T.B., S. Diarmond, T.D. Shanley, Maura Scannell, and Edelgard Soergel-Harbison. "Arch├Žological Excavations at Dunbeg Promontory Fort, County Kerry, 1977." Proceedings of the Royal Irish Academy. Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 81C (1981): 295-329.
The authors address the difficulty of understanding the fort's original outline: "The stone rampart as it stands to-day is probably the result of both the original builder's craft and the reconstruction programme undertaken by the Board of Works. Because of the lack of recorded details of this work it is virtually impossible to sort out the original remains from the 1890s reconstructions. The basic difficulty is in deciding whether the rampart was originally straight in plan, as shown by Du Noyer (PI. II) and all other researchers before Deane, or whether its two ends were curved."
T.J. Westropp wrote in 1910, "...something like a panic spread among Irish antiquaries, and the belief was most strongly expressed that the fort had been almost rebuilt, and most of its features altered." (Westropp, Thomas J. "Promontory Forts and Similar Structures in the County Kerry. Part IV. Corcaguiny (The Southern Shore) (Continued)." The Journal of the Royal Society of Antiquaries of Ireland 40.4 (1910): 267-274.)