It is usually maintained that before 1914 the Royal Navy had abandoned interest in amphibious warfare. This article argues otherwise. It shows that prior to 1914 the Admiralty sought to reconfigure the Royal Marines as an organic maritime strike force. The idea was advanced by junior officers and taken up by the naval leadership, who appointed a high-level committee to elaborate the details. Significant steps had been taken before war broke out, thereby showing that modern British amphibious warfare doctrine pre-dates the ill-fated Gallipoli operation and needs to be understood in a broader context than is currently the case. KEYWORDS Royal Marines; amphibious warfare; First World War; Royal Navy Amphibious warfare has been a hotly contested topic in military and naval history: when did it start, who was involved, and where? Its origins and development are of more than just academic interest, as the syllabus of any military college will attest. 1 History informs current thinking on the subject in so many ways, and so much of this historical interest pivots on Britain and its actions before and during the Great War, most especially the ill-fated seaborne assault on Gallipoli in 1915. This article substantially extends our understanding of this topic by re-evaluating the place of amphibious warfare in pre-1914 British naval planning. Existing works universally depict the British military leadership as having abandoned all interest in combined operations early in the first decade of the twentieth century, with the Navy following suit in late 1911. In direct contrast to this interpretation, it will be argued here that, far from abandoning amphibious warfare, the Admiralty actually developed a heightened belief in its value in the two years prior to the outbreak of the First World War. Indeed, so deep was this conviction that Britain's naval leaders, aware of