Necessary instructions in regard to rendezvous and courses will be found in the sealed instructions. These will be opened only as directed on the outside of the envelope. Before dark a rendezvous for 4 P.M. of the day following will be signalled by the Escort Commander. Nothing that floats will be thrown overboard. All waste material that can be burned will be burned. Tin cans must be well punctured before being thrown overboard. Garbage that cannot be burned shall be accumulated in suitable receptacles and thrown overboard from all ships simultaneously one hour after sunset each night. _Submarine Attack_ The following is generally accepted: Submarines on surface are visible on the horizon. Submarine awash is visible about five miles. Submarine submerged, periscope showing, is not visible more than two miles unless periscope appears against skyline. Porpoising of submarine as it comes to the surface to obtain sight through periscope creates a distinct wake which is more clearly visible than the wake of periscope when submarine is steadied. Under poor conditions of atmosphere and sea the probability of detecting a submarine decreases. It follows that constant vigilance alone will insure the early detection of a submarine. The wake of a torpedo is distinctive and can easily be picked up in smooth water at a distance of two thousand yards. In rough water it is difficult to observe the wake. [Illustration: NUMBER TWO GUN CREW ON WATCH] [Illustration: THEY ARE ALL SEA DOGS TOGETHER] Daylight attack by surface craft (enemy raider), will be handled by signal from the Convoy Commander. Daylight attack by submarines shall be handled as follows by each vessel: (a) Open fire instantly on any submarine sighted. Don’t delay the first shot even if it is apt to go wild,—it will show the direction of the submarine and will have a pronounced moral effect. (b) Continue to fire as rapidly as possible. Short shots interfere with the ability of the submarine to see and aim. (c) If submarine appears less than six points on bow and not more than 2000 yards away, head for submarine at best speed. (d) If submarine appears more than six points on bow, abeam, or on the quarter, head directly away from submarine at best speed. (e) If torpedo wake only is seen, fire gun immediately and indicate direction to other ships and manœuvre to avoid torpedo as in case of submarine, i.e.—turning towards torpedo if less than six points. (f) Other ships of convoy turn from direction of submarine and scatter at best speed, maintaining keenest lookout for torpedo wake and for a possible mate of the attacking submarine. (g) Resume course when it is deemed that your vessel is outside the danger zone of attacking submarine.