The towers themselves must be either round or polygonal. Square towers are sooner shattered by military engines, for the battering rams pound their angles to pieces but in the case of round towers they can do no harm being engaged as it were in driving wedges to their center.
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This outcome is supported by the facts we have found – but I also know these findings may not be consistent with some people's expectations. To all those who have closely followed this case, and who have engaged in the important national dialogue it has inspired, I urge you to read this report in full.
Eric Holder