Jagdtiger: The Most Powerful Armoured Fighting Vehicle of World War II

Check it out.
While you are correct that most sucumbed to failure, or demolition, when it found a target, the target generally lost. Even in the limited use of the vehicle it is credited with stopping no fewer then 5 local area offensives. I am not saying that a Tiger or any large calibered weapon system could not have repeated this if the JagdTiger had not been there, I am only saying that "completly worthless" is not quite accurate.

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