| Chap. | Page |
| Prologue: The Command of the Sea (A.D. 1915) | [9] |
| I. | A Lesson from Cæsar | [19] |
| II. | Ancient War-ships | [28] |
| III. | Fighting-ships of the Middle Ages | [38] |
| IV. | Mariners of Other Days | [54] |
| V. | Some Mediæval Sea-fights | [60] |
| VI. | The Navy in Tudor Times | [67] |
| VII. | From Elizabeth to Victoria | [81] |
| VIII. | The "Turks" in the Channel | [99] |
| IX. | The Honour of the Flag | [115] |
| X. | The Evolution of Naval Gunnery | [125] |
| XI. | Evolution of the Ironclad Battleship | [146] |
| XII. | The Evolution of the Submarine and Submarine Mine | [167] |
| XIII. | Naval Brigades | [187] |
| XIV. | War-ships of all Sorts | [204] |
| XV. | The Manning of a Ship | [223] |
| XVI. | Beginning of the War Afloat | [242] |
| XVII. | Operations in the North Sea and Channel | [254] |
| XVIII. | In the Outer Seas | [261] |
| XIX. | A Reverse and a Victory | [272] |
| XX. | German Raids and their Signal Punishment | [285] |
| XXI. | The Royal Naval Air Service | [292] |
| Conclusion | [307] |