The Battle of Savo Island
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The Battle of Savo Island Author: 6th grader, 11 year old USS Chicago (in foregroud) mauvering off Tulagi on August 9 1942. 80-G-K-386 Naval History & Heritage Command. 1 The Guadalcanal Campaign, codenamed Operation Watchtower, was a military campaign during World War 2. The first American offensive of the war was triggered by reports in early 1942 that the Japanese were building an airfield on Guadalcanal island. If they succeeded, Japanese planes based on the airfield would be able to disrupt the supply line from America to Australia, so the allies decided to invade Guadalcanal. However, the first naval battle of the campaign, the Battle of Savo Island, was a stunning defeat for the allies. This was mainly due to the ignorance, incompedentnes, and unpreparedness of the allies. On August 7 1942, the invasion started, with American marines storming ashore on Guadalcanal, Tulagi, Gavutu, and Tanambogo. This was the first American offensive of the war. The invasion, codenamed Operation Watchtower, was supported by a fleet of more than 80 warships, including the carriers of Task Force 61, the Saratoga, Enterprise, Wasp, and Hornet. At the start of the campaign, Japanese strength on Guadalcanal was 2,800 personnel, with 2,200 being forced laborers; and on Tulagi were 900 Japanese naval troops. Tulagi, Gavutu, and Tanambogo were assaulted by about 7,000 Allied personel, and Tulagi was quickly taken on August 8th, while the latter two were taken a day later. Guadalcanal was invaded by 11,000 marines, and the airfield was soon taken. The Japanese abandoned the facility but not the island. USS Saratoga at Pearl Harbor on June 6 1942. The commander of the allied 80-G-10121 courtesy of the Naval History & Heritage Command. expeditionary forces and TF 61, Vice Admiral Frank Fletcher, was concerned about the possibility of losing his carriers, which were low on fuel. Thus he ordered his carriers to withdraw from the Solomon Island area on the evening of August 8, despite heavy criticism that leaving the invasion transports without carrier support would have left them vulnerable to both surface and air attack. The Imperial Japanese Navy’s (IJN) responded by sending a force consisting of the heavy cruisers Chokai, Aoba, Furutaka, Kako, Kinugasa, the light cruisers Tenryū, Yūbari, and the destroyer Yūnagi, under the command of Vice Admiral Gunichi Mikawa. The IJN were experts in night fighting, and Mikawa hoped to strategically exploit this advantage by engaging the Americans on the night of August 8 to 9. The torpedoes they carried, type 93 “Long Lance,” were extremely deadly and far superior to any allied torpedo. It could bring a 1000 pound warhead as far as 40,400 meters. The Japanese force was sighted in the St George Channel on the morning of August 8 by the submarine USS S-38, which itself was too close to fire torpedoes. The reports were considered vague and were ignored. At 10:20 and 11:10 the force was again sighted by two Royal Australian Air Force Hudson aircraft. The first 2 Hudson erroneously reported the force as “three cruisers, three destroyers, and two seaplane tenders.” When they failed to receive acknowledgement of their report, the crew returned to base to report the sighting at 12:42. The second Hudson falsely reported the force as “two heavy cruisers, two light cruisers, and one unknown type.” The second Hudson’s radio also failed, but it finished its patrol and landed back at base at 15:00. For reasons unknown, these reports were only sent to the Allied fleet at 18:45 and 21:30. Mikawa had launched 4 floatplanes from his cruisers earlier and the floatplanes reported two groups of allied ships off Guadalcanal and Tulagi. Mikawa sailed down the New Georgia Sound USS Ralph Tabot circa August 7-8 escorting the Operation Watchtower invasion (also Known as “the Slot”) completely convoy. HMAS Australia is dimily visible in the far right. USMC 61603 courtesy of the Naval History & Heritage Command. undetected towards these two islands. Meanwhile British Vice Admiral Victor Crutchley decided to split the force under his command into three smaller forces to cover the allied transports unloading in the area between Guadalcanal and Florida island. A southern force consisting of the Australian cruisers HMAS Australia, HMAS Canberra, the American cruiser USS Chicago, and the destroyers USS Bagley, and USS Patterson. This group patrolled the area between Lunga Point and Savo island. A northern group was made up of the cruisers USS Vincennes, USS Astoria, USS Quincy, and destroyers USS Helm and USS Wilson. The Northern group conducted a box shaped patrol between the Tulagi anchorage and Savo island. The final eastern group consisting of the HMAS Hobart, USS San Juan, and two destroyers were to patrol between Florida island and Guadalcanal. Crutchly placed two radar equipped destroyers, USS Blue and USS Ralph Tabot west of Savo island. At this time the allied forces were not aware of the limitations and advantages of radar, which then was a new piece The Postioning of the allied forcecs before the Battle of Savo Island. U.S. Navy / Public Domain of technology. Captain Bode of the Chicago was under the false impression that his radar would give away his position. He only allowed one sweep from his fire control radar every half an hour. The last sweep before the engagement was too early to detect the Japanese forces. As will be shown later, this would turn out to be a crucial mistake. 3 In the evening, the commander of the allied amphibious forces, Admiral Richmond Kelly Turner called a conference to discuss the schedule of the invasion. Crutchley was to attend the conference and he left the southern group in HMAS Australia. This placed Captain Bode of the Chicago in command of the southern group. At the conference Turner, Crutchley, and Major General Alexander Archer Vandegrift who was the marine commander at Guadalcanal, discussed the report of the Japanese force that included the misidentified “seaplane tenders”. They decided that it wouldn’t be a threat because seaplane tenders were not supposed to engage in surface actions. As the Japanese force neared the Guadalcanal area, Mikawa ordered three floatplanes to be launched for a final reconnaissance sweep. Several allied ships sighted or heard the planes, but none of them thought it as a threat, and the planes were not reported to Tuner of Crutchley. The formation approached in a 3km column led by Chokai. Between 00:44 and 00:54 on August 9 Japanese lookouts spotted the Blue 9km away. Minutes later the Japanese force sighted the Ralph Tabot. A few minutes after that, Japanese lookouts spotted Bode’s southern force. At 1:38, the Japanese began launching salvos of torpedoes The Japanese cruiser Chokai firing her main battery during exercises in 1933. at the southern force. At the NH 73024 courtesy of the Naval History & Heritage Command. same time, lookouts on the Chokai spotted the allied northern force. At 1:43, the Patterson spotted a ship, most likely the Kinugasa, and sent a warning by signal lamp and radio. The Patterson went to full speed and began to fire star shells to illuminate the Japanese column. At the same time the Japanese float planes overhead dropped flares over Canberra and Chicago. Captain Frank Getting of the Canberra immediately ordered full speed ahead, a reversal of an initial turn to port, and for her guns to engage any visible targets. Less than a minute later Chokai and Furutaka opened fire at Canberra, joined a moment later by Aoba and Kako. Within 3 minutes, Canberra was savaged by a concentrated barrage of more than 30 Japanese shells, killing Captain Getting and other senior officers. At once Canberra’s boilers were destroyed, killing all power and light on the ship. During the engagement, the Chicago never fired its main battery. A torpedo from Kako struck the Chicago’s starboard side, a second torpedo hit but failed to explode, and a shell struck the mainmast. The secondary five inch batteries managed to hit the Tenryū, killing 23 men, but the darkness hid larger targets. Chicago continued to steam west for 40 minutes, but most importantly, Captain Bode neglected to inform Crutchley or any other allied ship in the area about Mikawa’s force. This act of incompedentnes would be a massive mistake. 4 Meanwhile, Mikawa’s force continued steaming, rounding Savo island on a counterclockwise course, heading towards the allied northern force. As the Japanese ships headed on their way, the Tenryū, Yūbari, and the Furutaka took a more westward course. This way, the northern force would be enveloped and attacked from two sides. While Mikawa’s ships were combating the southern force, the three cruisers of the northern force were tracing a box shaped patrol pattern 5 miles aside, with the Vincennes leading the Quincy, with the Astoria at the rear. The ships were cruising at a leisurely 10 knots and all three captains were asleep. The crews of the ships were at “condition II”, meaning that half the crew was on duty while the other half rested. Crewmen of all three cruisers all either heard the warning from Patterson or saw the flares from the engagement with the southern force, but it took time to go to general quarters from condition II. At 1:40, Japanese cruisers began firing torpedoes at the northern force. At 1:50, the Japanese force lit the Americans up with their searchlights and opened fire. The Astoria had gone to general quarters at 1:49, and at 1:52, the main battery director sighted the japanese cruisers and opened fire.