First US air raid on Ponape, by 40+ B-24s; Japanese Wikipedia dates the first large raid to 15 February.
What happened
The raid was the first Seventh Air Force strike on the Caroline Islands. US aircraft then bombed Pohnpei repeatedly, and the town of Kolonia was badly damaged. Japanese Wikipedia dates the first large raid to 15 February and says heavy attacks lasted until May.
Related image
Not a photograph of this event itself; the caption says what it shows.

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“North Pacific Ocean: East Caroline Islands: Senyavin Islands”, a US hydrographic chart (No. 81435, 1st edition) dated 1 May 1944, with an inset of Matalanim (Madolenihmw) Harbor on Ponape (Pohnpei). Depths are in fathoms.
United States hydrographic chart No. 81435, 1st edition (catalogued under the US Defense Mapping Agency Hydrographic Center). UC San Diego Library, Special Collections and Archives, Pacific Basin Nautical Charts.
Public domain (UC San Diego Library: “Public Domain. This work may be used without prior permission.”) Source record