Millions of soldiers of the USSR died to fission shells, Faustpatrones, Panzerfausts and RPzB rockets and the war & Holocaust lasted long in spite of the Soviet human superiority (in terms of numbers) because of these weapons and because the Allies who also developed these weapons kept them for themselves. France lost in 1940 because of the first fission shells that Nazi Germany quickly developed, more industrially than France even though France had its own nuclear industry after the Joliot-Curie et alii patent for the fission bomb (here). One of Russia’s and France businesses today is to sell very similar weapons like the RPG-7. All of these weapons use nano levels of fission so only a tiny amount of HEU or PU is needed for each shell (maybe one gram per shell, concentrated by compression with kinetic forces at impact, lowering critical threshold – the fact that increasing density reduces critical mass is well-known, see Wiki https://en.wikipedia.org/wiki/Critical_mass#Changing_the_point_of_criticality, and hydrogenated plastic is in addition mixed with HEU or Pu to moderate neutrons and reduce once again critical mass -the abovementioned patent mentions compression and hydrogen).
Again, nothing else than supercritical fission can melt down holes in armour like this, so precisely like laser (even though we think that low energy nuclear reactions are a great substitute). Here is a “delayed blast” (second wave of supercriticity triggered by the progressive arrival of delayed neutrons from the impact) : https://youtu.be/9NwX0EYht7g?t=3m51s and for more cases of this typical phenomenon with fission shells see article on flashs (scroll down).
The Soviet army also had anti tank shells copied on captured German shells, certainly with help from the V. G. Khlopin Radium Institute, but in harsh undersupply, and with quality issues (see here, external link (no talks about fission there of course)).
France lost because of Nazi Germany’s rush to the technology and massive immediate use, making the “Blitz” possible. With humanly inferior forces Nazi Germany also managed to keep the Soviets at bay for long, inflicting them so much losses. Fission shells, Panzerfausts and PZrB rocket grenades, also with fission (see article), stopping tanks, led also to huge infantry losses. Russia commemorates all the victims yet won’t acknowledge what caused their deaths. It is a shame that the Russian authorities won’t disclose their people, millions of soldiers, civilians, were simply the victims of nuclear fission. All the public authorities of the major countries (USA, UK, France etc.) have the same responsibility to acknowledge that, France especially.