Peru v Kriegsmarine 

No, I haven't heard of anything like this. It is possible that the would have destroyed an U-boat, but warship....Only Panzerschiffe's  had range to reach Peru without being resupplied. Germany had three Panzerschiffe and none of them was sunk in Peruvian waters. Admiral Graf Spee, though, was scuttled in Montevideo, but that's quite away from Peru...