Quotation from: The Land That Time Forgot

Written by: Edgar Rice Burroughs

The submarine was withdrawing toward the north, but all the time
it was shelling the open boats, three of them, loaded to the
gunwales with survivors. Fortunately the small boats presented
a rather poor target, which, combined with the bad marksmanship
of the Germans preserved their occupants from harm; and after a
few minutes a blotch of smoke appeared upon the eastern horizon
and the U-boat submerged and disappeared.