An eyewitness account recounts the planning, assembly, and execution of a large maritime mine-laying campaign in the North Sea, describing bases, logistics of mine supply and assembly, conversion and operation of specialized minelaying ships, formation tactics, and daily life aboard. It explains technical challenges and adaptations, summarizes a sequence of numbered minelaying excursions, records incidents and coordination with escort forces, and assesses results and subsequent sweeping and postwar activities. Illustrations and chapterized sections document equipment, procedures, and organizational lessons learned.