[Leandros]

My safest technique is to sidestep the oncoming destroyer and give him a tail-shot. It goes like this:

When you detect a destroyer approaching - turn against him till you have him approx 35 degrees on the bow. Continue straight ahead. If he is coming straight towards you your bow torps get an angle on him and you can take him with a bow torp going under him at an angle. Go full speed just before he approaches the 400 meters mark (minimum firing distance). Use TI on highest speed with magnetic fuze. You can also release a salvo from the same position. If this misses him, lower periscope and turn against him, full speed. He is not able to follow you around. When he has passed, periscope up. Track him as he continues the turn behind you and you continue your turn at full speed. He will end up with his broadside against you approx 400 meters behind you. Give him a TI at full speed, magnetic fuze. For this purpose I always have only TI's loaded aft. And a couple ready forward.

A variation, if you do not have time to turn against him is to let him pass beside you while you are at max turn. Just before he has passed turn against him. His side-throwers shall pass over you and the aft droppings beside you. Then go full aft while you turn after him. After you have started going backwards give opposite rudder, that way your bow turns against him. Soon you have him in the same position as in the first example. Same procedure.