Soon after our vessels arrived in August, 1917, Rear Admiral H. S. Grant, British Royal Navy, senior naval officer in command at Gibraltar, drew up the plans by which the "H. G." (Home-Gibraltar) and "G. H." (Gibraltar-Home) convoys were organized between the United Kingdom and the Mediterranean. These also included ships bound to and from French ports in the Bay of Biscay and ships bound to the United States. Destroyers, sloops and special service vessels accompanied each convoy as a danger-zone escort through the Straits of Gibraltar to 10 degrees west longitude and there waited for, or met, an incoming convoy from England. Men-of-war acted as ocean escort to the convoys from that point to British waters, where they were met by a danger-zone escort at the end of the route.
At the beginning of October, 1917, a system of fast convoys, sailing every sixteen days, between the United Kingdom and Port Said, and vice versa, was organized. These were met at a rendezvous in approximately longitude 10 degrees west by naval vessels which escorted them to Gibraltar, where they were relieved usually by ships from the Malta command, to take them through the Mediterranean. These convoys were joined at Gibraltar by ships of over 10-1/2 knots speed, which were taken out by relief escorts and joined the convoy off Europa Point. The first of the through outward-bound convoys, O. E. 1 (outward eastward) passed Gibraltar October 11th, and the first through homeward bound convoy, H. E. 1, passed on November 26th.
By December most merchantmen which arrived at Gibraltar had been in convoy at one time or another, and it was possible to sail ships bound for North and South American ports in separate small convoys, with one master and commodore, escorted through the danger zone to longitude 10 degrees west. Between that time and the middle of February, 1918, 207 ships were thus sailed to the Americas.
More escort ships being available, and enemy submarine cruisers becoming active, ships for United States and South American ports were, beginning February 27, formed into convoys, two, a fast and a slow one, sailing on the same day, each accompanied by the danger-zone escort to longitude 30 degrees west, then proceeding "on their own" to longitude 70 degrees west to be dispersed to their proper destinations. Under this revised system there were sailed to American ports 1,013 ships, totalling 4,371,063 gross tons. These were called W. A. Convoys (Western Atlantic).
The main artery for supply of the Allied armies operating in Egypt, Palestine, Greece, Italy, Northern Africa and Southern France ran through the Gibraltar area, requiring a great amount of offensive work against enemy submarines, in addition to escorting convoys. Patrol of the Straits was carried on by torpedo boats, motor launches, sub-chasers and vessels of small displacement, entailing hardships and exposure in every kind of weather.
Numerous attacks on U-boats were reported in this region. The British Admiralty credited the U. S. S. Lydonia (Lieutenant Commander R. P. McCullough) and H. M. S. Basilisk with sinking a submarine while escorting a Mediterranean convoy, May 8, 1918. In latitude 38 degrees 06´ north, longitude 3 degrees 3´ east, the Lydonia sighted the wake of a torpedo which sank the British steamship Ingleside. The British and American ships immediately attacked, dropping a barrage of depth-charges, which destroyed the enemy. The submarine was the German UB-70, and the British Admiralty awarded these vessels the credit, rarely given, of "known sunk."
Commander Richard P. McCullough, commanding the Lydonia, was officially commended by the British Admiralty and the British senior naval officer at Gibraltar, as well as by our own authorities. Lieutenant Claud F. Reynaud, the executive officer, was also given special commendation. Sighting the torpedo at the instant it was fired, Reynaud started his stop-watch, timed the run of the torpedo, made immediate change of course to the position of the submarine and noted its bearings. This enabled the commanding officer to track the probable movements of the submarine, which was destroyed by depth-charges from the Lydonia and the Basilisk.
Credit was also given for the sinking of a submarine by the Wheeling, Surveyor and Venetia. While on escort duty, May 15, 1918, in latitude 36-03 N., longitude 1-47 W., these vessels sighted the track of a torpedo which struck a merchant ship of the convoy. They dashed down the wake made by the U-boat's periscope, dropping depth-charges which soon put the submarine out of business.
The notable record of the Venetia is recited in Admiral Niblack's recommendation of its commanding officer, Commander L. B. Porterfield, for special commendation:
While escorting Gibraltar-Bizerta convoy, on May 11, 1918, an enemy submarine, which was not seen, torpedoed the French steamship Susette Fraisenette at 3:39 a. m. With excellent judgment he assumed that submarine had dived under the convoy, and in following out the theory sighted the submarine on the surface at daylight, compelling it to submerge. This submarine was subsequently sunk in the Adriatic, and the survivors testified that the attack of the Venetia on this occasion drove them off, and saved the convoy from further attack. Commended in British Senior Naval Officer's letter 78-14 of 24th May, 1918, and British Commander-Chief's Mediterranean letter No. 2089-93 of 23 June, 1918.