Guadalcanal
Macdonough returned to the western Pacific to prepare for the Guadalcanal invasion. Operating with Saratoga, she provided cover for the landings on Guadalcanal and Tulagi, 7 August 1942. She remained in the area, taking part in the Battle of Savo Island and fighting aircraft and shipping during the landing of reinforcements on the island. At the end of September, she commenced escort work between New Guinea, Espiritu Santo, and Pearl Harbor until reporting to Mare Island, 22 December, for overhaul.
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