of premature detonations of I-20′s torpedoes, her commanding officer ordered her crew to disassemble and examine a Type 95 torpedo on 5 July 1942. On 21 July, she moved into the Gulf of Aden before departing her patrol area and proceeding to Penang, which she reached on 5 August 1942. She later set course for Japan, arriving at Yokosuka on 23 August 1942 to undergo an overhaul. Guadalcanal campaign Meanwhile, the Guadalcanal campaign had begun on 7 August 1942 with U.S. amphibious landings on Guadalcanal, Tulagi, Florida Island, Gavutu, and Tanambogo in the southeastern Solomon Islands. With her overhaul complete, I-20 got underway from Yokosuka on 24 October 1942 to take part in the fighting in the Solomons. On 2 November 1942, I-16, I-20, and I-24 formed an attack group and each received orders to load a midget submarine delivered by the seaplane tender at an anchorage off Shortland Island in the Shortland Islands, then proceed to the Indispensable Strait. I-20 loaded her midget submarine, No. 11, on 5 November. She launched No. 11 north of Cape Esperance on Guadalcanal′s northern coast at 05:20 on 7 November 1942. No. 11 hit the anchored U.S. Navy 2,227-ton miscellaneous auxiliary , with a Type 97 torpedo, inflicting enough damage that Majaba had to beach herself on Guadalcanal to avoid sinking, although she later was salvaged. The destroyers and counterattacked with depth charges, but No. 11 escaped unscathed. No. 11′s crew scuttled her and swam safely to Guadalcanal, and I-20 proceeded to Truk. At Truk, I-20 embarked the midget submarine No. 37 and departed on 13 November 1942. She arrived at her launch area off Lungga Point on the northern coast of Guadalcanal on 18 November, and launched No. 37 off Cape Esperance at 03:00 on 19 November 1942. At 03:02, No. 37 developed a serious oil leak from her steering system, but she pressed ahead on the surface. Sighting no targets off Guadalcanal, her two-man crew scuttled her off Cape Esperance at 09:55 and swam safely to shore on Guadalcanal. At Truk, I-20 embarked the midget submarine No. 8 and departed on 26 November 1942. She arrived at her launch area off Lungga Point on 1 December 1942. She launched No. 8 off Savo Island on 2 December. On 3 December, No. 8 sighted several targets, including transports and destroyers, off Guadalcanal. She ran aground but freed herself, then fired both of