I have encountered what appeared to be "stragglers" in a convoy before but never so lucky to get a large liner like those. The big ones do seem to be easy to sink though don't they? Especially when you have some knackered little coastal freighter that won't sink with just one torpedo.
I ran into convoys with the circle icon as well. The only difference I can see from any normal convoy is that they seem to contain troop transports.
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