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USS Big Horn (AO-45)
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====Atlantic Fleet==== Sailing to Boston on 23 April, ''Big Horn'' entered the [[Boston Navy Yard]] for conversion to a [[Q-ship]]. A disguised heavily armed merchantman, the decoy ship was intended to lure unsuspecting U-boats to the surface and sink them with gunfire. While at Boston, ''Big Horn'' completed her disguise as a [[fleet oiler]] and was given extra watertight integrity – in case she was torpedoed – by the installation of thousands of sealed empty drums in her cargo tanks. That work was completed on 22 July 1942. After two days on the [[degauss]]ing range and in calibrating compasses and radio direction finders, ''Big Horn'' proceeded to [[Casco Bay]] for training under Commander, Destroyers, [[U.S. Atlantic Fleet|Atlantic Fleet]]. This training period was followed by a shakedown cruise which was completed on 26 August 1942, at which date USS ''Big Horn'' put in again at the Navy Yard, Boston, for further alterations and repairs until 12 September. As U-boats had been attacking [[bauxite]] ore cargo ships in the [[West Indies]], the Q-ship sailed south to help defend the convoy routes there on 27 September. '''1942''' The first cruise of USS ''Big Horn'' began on 27 September 1942, when the ship proceeded from New York with a [[convoy]] bound for [[Guantánamo Bay]], Cuba, taking a position which permitted the vessel to act as a straggler. The trip was made without incident, and thereafter ''Big Horn'' was semi-attached to NOB [Naval Operating Base] [[Trinidad]], with orders to operate from that base over the [[bauxite]] route to and from ports where that commodity was loaded. Many ships in this area had been sunk in recent weeks. Ships proceeding from Trinidad were convoyed to a designated point from which they fanned out to take various routes to their ultimate destination. ''Big Horn'' was directed to proceed to that point and drop down on independent routes to and from bauxite ports. After joining south-bound convoy GAT-11 at Guantánamo Bay, the ship – using her old call sign of ''Gulf Dawn'' – purposefully lagged behind the convoy en route to Trinidad. No U-boats were tempted to attack, however, and the ship moored in [[Port of Spain]] on 9 October. On 16 October 1942, ''Big Horn'' sailed in convoy T-19 from [[Trinidad]] to the point of separation. That same afternoon, three [[U-boat]]s attacked the convoy, and at 15:20 in {{coord|11|00|N|61|10|W}}, the British steamer SS ''Castle Harbour'' was hit on the starboard side by a [[torpedo]] and sank in less than two minutes. At almost the same time the United States steamer {{SS|Winona||2}}, coal-laden, was struck forward on the starboard side. Later she limped into Trinidad. Soon afterwards, lookouts on ''Big Horn'' sighted a [[U-boat]] moving at periscope depth on the port beam, but in such a position that no action could be taken without damaging the United States troopship ''Mexico'' or the Egyptian ship ''Raz El Farog''. At 16:27, lookouts on ''Big Horn'' again sighted a periscope and conning tower, on the port side, and her four-inch (100 mm) gun was trained in that direction just as a [[submarine chaser]] crossed through the line of fire and dropped five [[depth charge]]s. Thereafter, the cruise in these waters was continued without incident for several days and ''Big Horn'' returned to NOB Trinidad about 29 October. A second cruise in company with a convoy from Trinidad was begun by ''Big Horn'' on 1 November 1942, to a point nearly due north of [[Paramaribo]], where the vessel left the convoy and proceeded on varying courses without incident until return to [[Trinidad]] on 8 November 1942. On 10 November 1942, USS ''Big Horn'' sailed in convoy TAG-20, with the [[gunboat]] [[USS Erie (PG-50)|USS ''Erie'']] (PG-50), two PC-boats ([[submarine chaser]]s), and a PG-boat ([[patrol gunboat]]) acting as escorts. Because of submarine warnings, the convoy changed course so that the approach to [[Curaçao]] was made from the south and west. Because of engine difficulties, USS ''Big Horn'' dropped out of the convoy at 15:30 on 12 November 1942, in company with a [[Venezuela]]n tanker, and arrived at a point about {{convert|1.5|mi|km}} off [[Willemstad]] harbor, where the Curaçao-[[Aruba]] subsidiary convoys were joining the main convoy. At 17:02, a great volume of smoke was sighted as it rose from ''Erie'''s stern, about {{convert|1000|yd|m}} on the starboard bow of ''Big Horn'', at {{coord|12|07|N|68|58|W}}. ''Erie'' had been torpedoed on the starboard side aft. ''Big Horn'' called General Quarters, increased speed to {{convert|11|kn|km/h|0}} and proceeded for the scene of action, but repeated orders from Willemstad forced ''Big Horn'' to alter course at 17:25 and proceed to Willemstad. ''Erie'' swung into the wind; efforts to subdue the fire were unsuccessful. The gunboat was finally beached, officers and crew abandoning ship. On 21 November 1942, USS ''Big Horn'' proceeded from [[Curaçao]] with a convoy bound for New York, The convoy proceeded on a course for Guantánamo with a Dutch gunboat and four SC-boats as escorts. Other vessels joined convoy at Guantánamo until on leaving that meeting point there were 45 ships and five escorts in company. The remainder of the cruise to New York via [[Caicos Passage]] was uneventful, and ''Big Horn'' anchored in [[The Narrows]] in [[New York Harbor]] at 20:40 on 1 December 1942. During the next few weeks, ''Big Horn'' entered the [[Todd Shipyard]] at [[Hoboken, New Jersey]], for what proved to be nine weeks of repair work and alterations. The latter included the installation of a [[mousetrap (weapon)|mousetrap]], a [[Hedgehog (weapon)|Hedgehog]] [[depth charge]] projector, and a DF (direction finding) radio receiver. '''1943''' She departed New York on 17 February 1943, and arrived at [[New London, Connecticut]], the following day. On 19 February 1942, Lieutenant Commander Farley assumed command of a newly organized Task Group consisting of ''Big Horn'' and three {{convert|173|ft|m|adj=on}} PC-boats: [[USS PC-560|''PC-560'']], [[USS PC-617|''PC-617'']], and [[USS PC-618|''PC-618'']]. Antisubmarine measures had been so successful that no vessels had been sunk in coastal waters since July 1942. This Task Group was designed to hunt U-boats in the central Atlantic; the three PC-boats would escort ''Big Horn'', which would act as bait and support in antisubmarine combat, as well as fuel and supply ship for the escorts. During the period from 2 to 14 March, this Task Group conducted training exercises in [[Long Island Sound]] with the submarine [[USS Mingo (SS-261)|''Mingo'']] (SS-261) supplied for the purpose by [[Commander, Submarine Force, Atlantic Fleet|ComSubLant]], During the next two weeks the Task Group made a shakedown cruise. After a short trip to New York between 20 and 28 March, the Task Group continued antisubmarine training against [[USS Muskallunge (SS-262)|''Muskallunge'']] (SS-262) until 9 April. ''Big Horn'' and the two subchasers then sailed south in Task Group 21.8 (TG 21.8) to New York, arriving there on 9 April. Convoy UGS-7A sailed on the morning of 14 April 1943, and the special Task Group joined up off New York and continued in company until 08:00 on 21 April, when the Group left the convoy and dropped astern {{convert|25|nmi|km|abbr=off}}, proceeding as straggler-with-escorts, although the escorts remained far enough astern so that they would not be visible to an enemy submarine sighting ''Big Horn''. The cruise was uneventful during the next two weeks. After several changes of course, ''Big Horn'' was at {{coord|29|00|N|28|10|W}} (about {{convert|500|mi|km}} south of the [[Azores]]) at noon of 3 May 1943. Early that morning, ''Big Horn'' had made radar contact with a suspected U-boat at a range of about {{convert|6|mi|km|spell=in}} and sent the two PCs to investigate. At 11:04, ''PC-618'' reported a submarine on the surface, distant about {{convert|6|mi|km|spell=in}}. At 12:35, ''Big Horn'' got a sound contact and delivered a [[Hedgehog (weapon)|Hedgehog]] attack just after sighting a periscope on the starboard bow at 12:42, followed by a heavy swirl as the U-boat dove. At 13:33 a second attack was delivered and the contact was lost. At 15:40 the contact was regained at {{convert|3700|yd|km}} and at 15:54, speed five knots (9 km/h), ''Big Horn'' delivered a third attack. About five of the [[Hedgehog (weapon)|Hedgehog]] projectiles (which detonate only on contact) exploded about 12 seconds after they entered the water, and ''Big Horn'' continued in to drop [[depth charge]]s. Considerable light oil came to the surface and continued to spread for two hours. At 01:03 on 4 May an oil patch was visible over an area of 200 to {{convert|300|yd|m}}. By daylight that morning, all traces of the oil slick were gone. As none of the vessels in the Group were able to establish contact during the next 44 hours, it was presumed that one submarine had been destroyed; that the other U-boat which had been sighted by the ''PC-618'' had moved out of the area. A postwar review of German U-boat losses, however, indicated that no submarines were sunk on that date in this area. Continuing on a homeward course, the commanding officer of ''Big Horn'' attempted to use the COMINCH (Commander in Chief, [[United States Fleet]]) daily submarine estimates as guides for fruitful changes of course, but after several attempts had failed to produce results, the Task Group Commander recorded in his log, on 13 May 1943: <blockquote>This makes three submarines we have attempted to intercept on our return trip, all of which we theoretically should have met. This experience again accents the hopelessness of trying to find submarines. The proper procedure, as originally planned, is to remain in the vicinity of convoys, to which the submarines will come. On the next trip, it is planned to stay within about {{convert|15|mi|km|disp=sqbr}}, or less, of the convoy</blockquote> After returning to New York on 17 May, the ship underwent another overhaul between 19 May and 16 July. On her final cruise as a Q-ship, ''Big Horn'' again she served as the flagship of a small Task Group which included only two other vessels: ''PC-618'' and ''PC-617''. Commander L. C. Farley had relieved Captain Gainard as commanding officer of ''Big Horn'' on 24 June because of the illness of the latter. The Task Group departed New York on 20 July 1943, and proceeded to Norfolk, where convoy UGS-13 made up and sailed on the morning of 27 July. On 29 July, ''Big Horn'' straggled from the convoy and streamed her [[Mark 29]] gear. For the next few days she trailed the convoy, distant about {{convert|50|mi|km|spell=in}}. On 4 August, U-boats were reported by COMINCH to be operating in the vicinity of 38°N, 38°W, and the Task Group changed course to intercept. On 6 August, a submarine was sighted in {{coord|41|31|N|36|11|W}} and attacked by ''PC-618'' with mousetraps which failed to explode. Thereafter the contact was not regained. An expanding box search was carried out during the next few days without results, then the group moved northward of the Azores. Planes from the [[escort aircraft carrier]] {{USS|Card}} (CVE-11) were sighted several times during this period and it later transpired that some of these planes had made definite kills of U-boats during that period. ''Big Horn'' was not so fortunate, in spite of frequent changes of course to intercept submarines reported by COMINCH. The cruise continued in the general area and as far south as the latitude of [[Dakar]], during the last weeks of August and throughout September. During the last week of September, a new search area was tried far to the north of the Azores, but again without success; then the homeward leg of the cruise was executed without event. ''Big Horn'' and her escorts stood up [[Ambrose Channel]] on 7 October 1943. On 14 October, COMINCH directed that ''Big Horn'' should be retained in active service but that no alterations or extensive repairs should be made without specific authorization of COMINCH. After training exercises in the New London area with a friendly sub from 29 October through 10 November, ''Big Horn'' made one more uneventful cruise in company with ''PC-617'' and ''PC-618''. On 11 November, the Task Group returned to New York to refuel and provision; on 15 November, the Task Group departed in company and proceeded on an eastward course until they had reached the hunting ground north of the [[Azores]] on 27 November. Searches were unsuccessful. ''Big Horn'' then steamed back to New London on 30 November, whence she conducted training in [[Long Island Sound]], before departing on a third "decoy" cruise on 19 December. Although she operated near a suspected U-boat concentration in the waters off [[Bermuda]], the Q-ship and her two subchasers had no contacts and returned to New York empty-handed on 30 December. In summarizing this cruise, the commanding officer of ''Big Horn'' wrote: <blockquote>It may be noted that during the period from 27 November to 1 December, this Task Group was in the midst of a group of from 10 to 15 U-boats. Nine contacts, sightings or attacks on U-boats took place in our immediate vicinity, so that it is most unlikely that we were not seen by some U-boats. Evidently the U-boats are wary of attacking an independent [[Tanker (ship)|tanker]]. If the Q-ship program has contributed to this wariness, as is suggested in several [[prisoner-of-war]] statements, many independent merchant ships may thereby have escaped attack, and the Q-ship program has thus been of value.</blockquote>
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