It definitely happens. I had a beautiful attack set up last night - two large cargoes, an ammunition ship and an ore carrier, all in the middle of a large convoy - but they started taking evasive action about 30s after my first TI left the tube. I know I wasn't spotted as I happily pootled around popping TIIs under bows for another half hour (game time) without the escorts coming within 1,000m of me.
Brings up a new question - what do you fire first, electrics or steamers?
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