"YCK-8 sinks (cause unspecified)"

MON 13 DEC 1943
Pacific
Submarine Pogy (SS-266) damages Japanese army cargo ship Fukkai Maru off Palau Islands, 07°06'N, 134°30'E, but is damaged by depth charges, 07°06'N, 134°31'E, and forced to terminate her patrol.

Submarine Pompon (SS-267) lays mines off Poulo Condore, southwest of French Indochina.

Submarine Puffer (SS-268) unsuccessfully attacks Japanese transport Teiko Maru (ex-Vichy French steamship D'Artagnan), 14°29'N, 119°59'E.

Submarine Sailfish (SS-192) sinks Japanese army cargo ship Totai Maru, 30°15'N, 132°30'E.

PBY sinks Japanese cargo vessel Tokiwa Maru, 03°30'S, 151°30'E.

Atlantic
Open cargo lighter YCK-8 sinks (cause unspecified) off Key West, Florida.

Destroyer Osmond Ingram (DD-255) is damaged by gunfire of German submarine U-172, 660 miles west-southwest of the Canary Islands, 26°19'N, 29°58'W, but takes part in sinking U-172, along with aircraft (VC 19) from escort carrier Bogue (CVE-9) and destroyers George E. Badger (AVD-3), Dupont (DD-152), and Clemson (DD-186).

USAAF aircraft bomb Kiel, Germany, sinking torpedo boat T 15 and minesweeper R 306, among other shipping.

Mediterranean
German submarine U-593 is sunk by destroyer Wainwright (DD-419) and British frigate HMS Calpe 150 miles northeast of Algiers, 37°38'N, 05°58'E.