| CHAPTER | PAGE | |
| I. | The Spirit of Submarine War | 1 |
| II. | The Evolution of the Submarine | 10 |
| III. | The Submarine of To-day | 36 |
| IV. | A British Submarine Base | 52 |
| V. | Submarines and War Policy | 68 |
| VI. | Submarine v. War-ship | 78 |
| VII. | War-ship v. Submarine | 95 |
| VIII. | British Submarines in the Baltic | 108 |
| IX. | British Submarines in the Dardanelles | 125 |
| X. | The U-Boat Blockade | 161 |
| XI. | Trawlers, Smacks, and Drifters | 178 |
| XII. | The Destroyers | 201 |
| XIII. | P-Boats and Auxiliary Patrol | 216 |
| XIV. | Q-Boats | 231 |
| XV. | Submarine v. Submarine | 256 |
| XVI. | The Hunted | 272 |
| XVII. | Zeebrugge and Ostend | 295 |