Ooops! "Friendly" Mines

TUE 4 AUG 1942
Pacific
Destroyer Tucker (DD-374), uninformed of its presence, is sunk in U.S. minefield laid the previous day

by Gamble (DM-15), Breese (DM-18), and Tracy (DM-19), in Segond Channel, Espiritu Santo, New Hebrides. Chartered transport President Coolidge is also lost as the result of striking a mine in the same field. [Not, however, until 26 October 1942, per the Wiki.]

Submarine Narwhal (SS-167) sinks Japanese merchant cargo ship Fukuyama Maru, 40°26'N, 141°50'E.