Oki, I´m in a Porpoise career/100% realism. At surface, I always pick up Merchants with escorting Warships at long range, moving away from me or at constant distance at medium/high speed. My procedure is to order highest surface speed to cut the distance, (I don´t know how close in meters/yards you can get before getting spotted), but It always ends the same way; the nasty destroyers soon forces me to crashdive surrounded by their long distances explosives and then depthcarghes. Well, I´m using TM and the hawkeyed INJ don´t let go at the first place. One time I went up to PD and managed to put a Bullzeye Torpedo at a destroyer. No BOOM, the torpedo went under, just as It often did in 1942. Anyway, It seems fruitless to battle the destroyers bxz. they are often more the one, but frustration can make a man go wild! (I probably shouldn´t have done It in real life). In submerged mode doing 9 knots at flankspeed there is no way I can keep up with the enemy, getting in fireposition.

My questions is, how do You deal with Merchants/Destroyers contacts as described in above? And do You battle the attacking escorts or simply pull the plug?