CentPac, end of December 1943:
The "methodic" approach being employed effectively in the SouthWest Pacific, is also applied in the Marshalls.
The US is able to secure air supremecy in the southern Marshalls, and advances beneath an air umbrella provided by the USMC and Naval fighters. Just north of Tarawa, Makin atoll quickly falls.
Several squadrons of cannon armed B-25H and Beufighters are employed at low-level, to finally drive off the IJN surface mine-layers (altho little can be done about the subs).
Under cover from F4U Corsairs, several heavy bombardment fleets, comprised of battleships and cruisers then begin to pound Mili, Majuro, Maloelap, and Wotje. Four days of strikes by the USN CVs puts Kwajalein out of commission (the IJN CVs are evidently too far away to effectively intercept, or have purposely declined the battle). In early October, Mili, Majuro, Maloelap, and Wotje are assaulted and fall in short order. Without significant interference by the Japanese, Allied losses are comparatively light.
With the eastern Marshalls secured, Allied CBs are quickly landed and develop the airfields of the 4x atolls. Kwajalein is pounded by air and sea for nearly 8x weeks. A few Japanese resupply ships attempt to get thru to Kwaj, but they are sunk by a screen of USN subs. Over the course of the year, Allied SigInt teams have managed to identify each of the 14 enemy formations. Estimates of defenders on Kwaj was around 50,000 troops and over 300 guns; a very heavily reinforced Division. Once it is believed that the bombardments have done all that they -can- do, the assault is ordered.
The Allied high command is not yet willing to release an OB for the assault on Kwaj, but suffice to say, it was "a lot".
The US assaults Kwaj with several USMC Divisions, US Army RCTs, CB Btns, and even a massive parachute drop. The paras actucally sustain fairly heavy losses (IJA flak accounts for the loss of nearly 70x C-46s!). Otherwise, the invasion goes fairly well. The stalwart defenders of Kwaj fight for 8 days, but are overwhelmed. The entire IJA 46th Division is wiped out to man (along with several other NavGd, SNLF, CD, AAA, and support formations).
The fall of Kwaj seals the fate of the rest of the Marshalls. The USN begins to send ASW and MSW patrols farther west, towards Eniwetok and Kusie island. The Japanse do send a successful raid vs. an ASW TF operating near Kusie Island, and sink several small sub-chasers. The IJN surface force is harassed on it's egress however, and the light cruiser Tama is hit by a single 500# bomb by LBA from Kwaj. Altho certainly not enougth sink the Tama, the IJN will be forced to consider the diminishing return of risking surface assets vs. the risk of LBA.
With IJN eyes on Kusie Island, the US makes a surprise move north to Eniwetok. Under heavy thunderstorms, the invasion TF manages to approach Eniwetok without being spotted. Allied troops are quickly put ashore, and the landing ships back-off before IJN forces can be sortied. The battle lasts but 4 days; there is final Japanese radio transmission declaring a Banzi charge for the Emporer, and then silence.
-F-
