This work addresses many persistent misconceptions of what the monitors were for, and why they failed in other roles associated with naval operations of the Civil War (such as the repulse at Charleston, April 7, 1863). Monitors were 'ironclads'- not fort-killers. Their ultimate success is to be measured not in terms of spearheading attacks on fortified Southern ports but in the quieter, much more profound, strategic deterrence of Lord Palmerston's ministry in London, and the British Royal Navy's potential intervention. The relatively unknown 'Cold War' of the American Civil War was a nevertheless crucial aspect of the survival, or not, of the United States in the mid 19th-century. Foreign intervention—explicitly in the form of British naval power—represented a far more serious threat to the success of the Union blockade, the safety of Yankee merchant shipping worldwide, and Union combined operations against the South than the Confederate States Navy. Whether or not the North or South would be 'clad in iron' thus depended on the ability of superior Union ironclads to deter the majority of mid-Victorian British leaders, otherwise tempted by their desire to see the American 'experiment' in democratic class-structures and popular government finally fail. Discussions of open European involvement in the Civil War were pointless as long as the coastline of the United States was virtually impregnable. Combining extensive archival research on both sides of the Atlantic, this work offers an in-depth look at how the Union Navy achieved its greatest grand-strategic victory in the American Civil War. Through a combination of high-tech 'machines' armed with 'monster' guns, intensive coastal fortifications and a new fleet of high-speed Union commerce raiders, the North was able to turn the humiliation of the Trent Affair of late 1861 into a sobering challenge to British naval power and imperial defense worldwide.

This book examines British naval diplomacy from the end of the Crimean War to the American Civil War, showing how the mid-Victorian Royal Navy suffered serious challenges during the period. Many recent works have attempted to depict the mid-Victorian Royal Navy as all-powerful, innovative, and even self-assured. In contrast, this work argues that it suffered serious challenges in the form of expanding imperial commitments, national security concerns, precarious diplomatic relations with European Powers and the United States, and technological advancements associated with the armoured warship at the height of the so-called 'Pax Britannica'. Utilising a wealth of international archival sources, this volume explores the introduction of the monitor form of ironclad during the American Civil War, which deliberately forfeited long-range power-projection for local, coastal command of the sea. It looks at the ways in which the Royal Navy responded to this new technology and uses a wealth of international primary and secondary sources to ascertain how decision-making at Whitehall affected that at Westminster. The result is a better-balanced understanding of Palmerstonian diplomacy from the end of the Crimean War to the American Civil War, the early evolution of the modern capital ship (including the catastrophic loss of the experimental sail-and-turret ironclad H.M.S. Captain), naval power-projection, and the nature of 'empire', 'technology', and 'seapower'. This book will be of great interest to all students of the Royal Navy, and of maritime and strategic studies in general.