This behemoth was one of the first 3 man turrets, designed in WW1 but not finished in time, so used in WW2.
The upgraded armour on one (or two) in WW2 made it among the the heaviest tanks ever at 72 tons and impervious to all anti tank guns of early WW2.
If the things were not 20 years old and were reliable they would have been really scary to the Germans.