The Lightweight Fighter DLC comes with the dangerous Cromwell B. This famous tank has taken part in a lot of battles and can help you win some of your own. This tank is fast, and its gun can turn the tide of the battle. Still, this is a medium, not a heavy tank, so you need to watch out and not allow your rivals to get too many shots in.
https://store.steampowered.com/app/1662502/World_of_Tanks__Lightweight_Fighter_Pack/
This content requires the base game World of Tanks on Steam in order to play.
https://store.steampowered.com/app/1407200/World_of_Tanks/
Free to keep when you get it before 22 May