[P/O W. 'Moggy' Cattermole]

Also those heavy mortars were used on city's i remember that i've saw a very rare footage were those mortars were mounted on the stug..tank

The super-heavy mortars were not mounted on StuG chassies! Definitely not! A StuG was an assault gun, essentially a support gun mounted on a standard German tank chassis (i believe a Panzer IV, but it may have been a Panzer III -- it depends on whether the StuG was a StuG III or IV). Anyway, the super-heavy mortars were mounted on massive tracked platforms that could hook up to railway bogeys for transportation. The mortars were 600mm calibre, i believe, and were used variously on the eastern front and during the battle of the bulge as well.


Interesting video, thanks!