certainly - sink them - they are clearly up to no good - there are any number of military purposes they could be fulfilling:
1. Spotting u-boats and other German naval movements and calling in air strikes or just reporting them to the Admiralty for tracking purposes;
2. Signals intelligence - intercepting German u-boat or other naval communications for the boys back at Blechley park to help them try to break our invincible Enigma codes;
3. Weather reports in preparation for allied air strikes or attacks like the Dieppe raid, Normandy invasion, etc.;
4. Pilot rescue picket duty for allied airmen having to ditch at sea because they're unable to make it back to their bases;
5. Catching fish that will be used to make fish and chips to be served to Royal Navy destroyer crews when in port laying over from convoy escort patrols, fortifying them to return to sea to attack your u-boat.
nuff said
