In January 1944, she joined the Northern Attack Force staging for the assault on the
Marshall Islands. As the primary fighter director ship for the initial transport group,
Macdonough at first operated off
Kwajalein Atoll. On 29 January, she proceeded to
Wotje Atoll and participated in the shore bombardment there until returning to Kwajalein on the 31st for the occupation of
Roi and
Namur Islands. The destroyer then took up radar picket duties until proceeding on to
Eniwetok Atoll. On 21 and 22 February,
Macdonough shelled Japanese positions on
Parry Island at the deep entrance to Eniwetok lagoon. A month later, she was a reference and rendezvous ship for carrier TF 58, then striking the
Palau Islands. Continuing her varied pace, she was at
Hollandia,
New Guinea, by 21 April, providing fire support for the landings there. Then, at the end of the mouth she steamed eastward to take up radar picket duty south of
Truk. During this assignment,
Macdonough, with the
light aircraft carrier and destroyer , sank the Japanese submarine on 30 April 1944. ==Marianas Campaign==