My experience with GW is that DDs can go down with one torpedo If you don't hit them in the amunition bunker they take longer but usually they sink. Larger ships need more. For example I have sunk an Aircraft Carrier with one torpedo but it was a lucky shot in the fuel tank. To sink HMS Nelson it took me 7 torpedoes and the HMS King George V 6. Thankfully GWX is using a far better and more realistic (in my view) damage model that makes sinking ships significantly easier.
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