In this case, two torpedoes are launched and diverged, as in Case 6; and in this case it is assumed that the torpedo vessel can outspeed the vessel attacked, which will enable her to bring a torpedo under the run of the vessel attacked, as shown by the drawing. [Illustration: Plate 10. Kell Bros. Lith. London. CASE 7.—ATTACKING A VESSEL IN MOTION COMING UP FROM ASTERN.] CASE 8. IF CHASED BY A HOSTILE VESSEL, AND IT IS DEEMED UNADVISABLE TO FACE HER AND PROCEED AS IN CASE 6. In this case, veer a torpedo astern, having first obtained a position a little on the bow of the chasing vessel. When it is known, by the length of the tow-rope out, that the torpedo is about abreast of her bow, hold fast the tow-rope, which will cause the torpedo to diverge, and be brought into contact, as shown in the drawing. As a last resort, drop spanned torpedoes. [Illustration: Plate 11 Kell Bros. Lith. London. CASE 8.—CHASED BY A HOSTILE VESSEL.] CASE 9. ATTACKING A VESSEL IN MOTION BY CROSSING HER BOW. In this case, the torpedo being diverged when near, will, after crossing the bow, be dragged into contact, as shown by the drawing. Torpedoes can be used with a stern-board, if necessary. The port torpedo, in this case, will be launched on the starboard side, and the starboard on the port side. [Illustration: Plate 12 Kell Bros. Lith. London. CASE 9.—ATTACKING A VESSEL IN MOTION BY CROSSING THE BOW.] In conclusion, it should be stated that a dark night and tempestuous weather are in favour of the attacking torpedo vessels; and these conditions are especially advantageous when attacking large, long, unwieldy vessels, and the greater the number of them together, the more easily can they be disabled or destroyed, by reason of consequent confusion. Though the sea torpedo can be used in the light of day, or darkness of night, by vessels of the present navies, armed with cannon, it is nevertheless earnestly advised that fast vessels be built of comparatively small size and cost, adapted to the service of and armed with torpedoes, by reason that such vessels can keep at sea for long periods without replenishing supplies of coals and provisions; and in conflict upon the ocean, can easily destroy or render unseaworthy vessels, how large soever they may be, and armed with any cannon and projectiles at present known. Hence the necessity of being prepared with vessels suited to the change in naval warfare, and with officers well practised in an arm which, sooner or later, will be adopted by all Maritime States, by reason of its economy and efficiency. In the tactics, here attempted to be rendered intelligible, it is presumed that the various modes of attack are by small handy vessels adapted to the service, and armed with torpedoes, against large unwieldy vessels, armed with cannon. When it shall have been clearly demonstrated, in actual war, that large vessels can be disabled or destroyed by small vessels, with