USS "Enterprise" (CV-6), was the seventh U.S. Navy vessel to bear the name.
 Colloquially called "the Big E", she was the sixth aircraft carrier of the United States Navy.
 A "Yorktown"-class carrier, she was launched in 1936 and was one of only three American carriers commissioned before World War II to survive the war (the others being "Saratoga" and "Ranger" ).
 She participated in more major actions of the war against Japan than any other United States ship.
 These actions included the Attack on Pearl Harbor (18 dive bombers of VS-6 were over the harbor, 6 were shot down with a loss of eleven men, making her the only American Aircraft carrier with men at Pearl Harbor during the Attack and the first to receive casualties during the Pacific War), the Battle of Midway, the Battle of the Eastern Solomons, the Battle of the Santa Cruz Islands, various other air-sea engagements during the Guadalcanal Campaign, the Battle of the Philippine Sea, and the Battle of Leyte Gulf.
 "Enterprise" earned 20 battle stars, the most for any U.S. warship in World War II, and was the most decorated U.S. ship of World War II, She is also the first American ship to sink an enemy vessel during the Pacific War, the sole surviving pilot of the six planes shot down over Pearl Harbor sank Japanese submarine I-70 on 10 December 1941.
 On three occasions during the Pacific War, the Japanese announced that she had been sunk in battle, resulting in her being named "The Grey Ghost".
Jun'yō (隼鷹 , "Peregrine Falcon" ) was a "Hiyō"-class aircraft carrier of the Imperial Japanese Navy (IJN).
 She was laid down as the passenger liner Kashiwara Maru (橿原丸 ) , but was purchased by the IJN in 1941 while still under construction and converted into an aircraft carrier.
 Completed in May 1942, the ship participated in the Aleutian Islands Campaign the following month and in several battles during the Guadalcanal Campaign later in the year.
 Her aircraft were used from land bases during several battles in the New Guinea and Solomon Islands Campaigns.
The Guadalcanal Campaign, also known as the Battle of Guadalcanal and codenamed Operation Watchtower was a military campaign fought between 7 August 1942 and 9 February 1943 on and around the island of Guadalcanal in the Pacific theater of World War II.
 It was the first major offensive by Allied forces against the Empire of Japan.
USS "Portland" (CL/CA–33), the lead ship of her class of cruiser, was the first ship of the United States Navy named after the city of Portland, Maine.
 Launched in 1932, she saw a number of training and goodwill cruises in the interwar period.
 In World War II, she saw extensive service beginning at the 1942 Battle of Coral Sea, where she escorted the aircraft carrier "Yorktown" and picked up survivors from the sunken carrier "Lexington" .
 She screened for "Yorktown" again in the Battle of Midway, picking up her survivors as well.
 She then supported the carrier "Enterprise" during the initial phase of the Guadalcanal Campaign later that year, and was torpedoed during the Naval Battle of Guadalcanal.
 The torpedo inflicted heavy damage which put her out of action for six months as she was repaired in Sydney, Australia and later San Diego, California.
The Battle of Savo Island, also known as the First Battle of Savo Island and, in Japanese sources, as the First Battle of the Solomon Sea (第一次ソロモン海戦 , Dai-ichi-ji Soromon Kaisen ) , and colloquially among Allied Guadalcanal veterans as The Battle of the Five Sitting Ducks, was a naval battle of the Pacific Campaign of World War II between the Imperial Japanese Navy and Allied naval forces.
 The battle took place on August 8–9, 1942 and was the first major naval engagement of the Guadalcanal campaign, and the first of several naval battles in the straits later named Ironbottom Sound, near the island of Guadalcanal.
Zuihō (瑞鳳 , "Auspicious Phoenix" or "Fortunate Phoenix") was a light aircraft carrier of the Imperial Japanese Navy.
 Originally laid down as the submarine support ship "Takasaki", she was renamed and converted while under construction into an aircraft carrier.
 The ship was completed during the first year of World War II and participated in many operations.
 "Zuihō" played a secondary role in the Battle of Midway in mid-1942 and did not engage any American aircraft or ships during the battle.
 The ship participated in the Guadalcanal Campaign during the rest of 1942.
 She was lightly damaged during the Battle of the Santa Cruz Islands during this campaign and covered the evacuation of Japanese forces from the island in early 1943 after repairs.
The Battle of the Santa Cruz Islands, fought during 25–27 October 1942, sometimes referred to as the Battle of Santa Cruz or in Japanese sources as the Battle of the South Pacific , was the fourth carrier battle of the Pacific campaign of World War II and the fourth major naval engagement fought between the United States Navy and the Imperial Japanese Navy during the lengthy and strategically important Guadalcanal campaign.
 As in the battles of Coral Sea, Midway, and the Eastern Solomons, the ships of the two adversaries were rarely in direct visual range of each other.
 Instead, almost all attacks by both sides were mounted by carrier or land-based aircraft.
The Eastern Promenade (Eastern Prom) is a historic promenade, 68.2 acre public park and recreation area in Portland, Maine.
 Construction of the Promenade began in 1836 and continued periodically until 1934.
 The 1.5 mi park was designed by the Olmsted Brothers design firm and experienced its greatest expansion from the 1880s to the 1910s.
 The Promenade rings around the Munjoy Hill neighborhood and occupies the farthest eastern portion of Portland's peninsula.
 The Promenade is home to many historical sites, including a mass grave and the mast of the "USS Portland"
The Battle of Cape Esperance, also known as the Second Battle of Savo Island and, in Japanese sources, as the Sea Battle of Savo Island (サボ島沖海戦 ) , took place on 11–12 October 1942 in the Pacific campaign of World War II between the Imperial Japanese Navy and United States Navy.
 The naval battle was the second of four major surface engagements during the Guadalcanal campaign and took place at the entrance to the strait between Savo Island and Guadalcanal in the Solomon Islands.
 Cape Esperance ( ) is the northernmost point on Guadalcanal, and the battle took its name from this point.
The "Zuihō" class (瑞鳳型 ) was a group of two aircraft carriers built for the Imperial Japanese Navy before World War II.
 Both ships were originally built as submarine tenders, but were subsequently converted into carriers.
 Completed in early 1942, "Shōhō" supported the invasion forces in Operation MO, the invasion of Port Moresby, New Guinea, and was sunk by American carrier aircraft on her first combat operation during the Battle of the Coral Sea on 7 May.
 "Shōhō" was the first Japanese aircraft carrier to be sunk during World War II.
 "Zuihō" played a secondary role in the Battle of Midway in mid-1942 and did not engage any American aircraft or ships during the battle.
 The ship participated in the Guadalcanal Campaign during the rest of 1942.
 She was lightly damaged during the Battle of the Santa Cruz Islands during this campaign and covered the evacuation of Japanese forces from the island in early 1943 after repairs.

Question: What carrier did the ship whose mast is in The Eastern Promenade support during the initial phase of the Guadalcanal Campaign?
Answer: Enterprise