How to consider this one: an Allied ship mistaking an Allied aircraft for an Axis ships...
Walrus X9529
19? The aircraft was acquired by the Royal Air Force (RAF).
19? The aircraft was allocated to 293 Squadron.
10Sep1944 The aircraft was sunk while taxying by a Royal Navy MTB which mistook it for a German E-Boat.
Source:
http://www.cnapg.org/walrus.htm