It's worth noting that the Hatteras Bar illustration, above, depicts a scene in which Vizetelly, on board one of the boats shown pitching in heavy seas, was nearly lost overboard, and that during the thunderstorm he pictures below, which was the most violent he'd ever seen, he was aboard a ship carrying a large tonnage of munitions! As powerful as the images themselves are, if you imaginatively project yourself into his situations... well, he certainly didn't lack for courage!
Indeed, such was the potency of his work that it became a sought after form of contraband itself. Meg Thompson writes, as part of a series called 'Drawing The War', that 'The Union was aware of Vizetelly’s whereabouts, and a bounty was offered to the Union Navy if they captured his sketches aboard any detained ships.' As a consequence of this situation, there were occasions on which Vizetelly's work, haivng been intercepted, would appear, uncredited, in Northern publications, such as Harper's Weekly.
All in all, I think Vizetelly's exploits in America during the Civil War make for a fascinating story, and his artwork and writings are an invaluable resource, both in their rawer annotated sketch states, and also in their more fully realised ILN format, as engravings, often accompanied by his lively reports from the scene of the actions depicted.