We've been discussing a rogue regiment and decided it wasn't going to have a happy fate. That provoked me for this similar armed forces scenario.
It is WWII and the Nazis have decided to eliminate the Warsaw Ghetto. The unhappy inhabitants are bravely resisting as happened in real life. Assume that this is our world and not a superhero populated ones, like in the MU Invaders stories or the JSA where the Spear of Destiny kept heroes out of Europe.
In the ghetto, mystic powers are found that allow the reach across universes to the 616 MU and current DCU - all the peak humans of each (Cap, Bats, and similar folks including peak villains are transported to the Ghetto). All are committed to fight the Nazis - no self-interest betrayals allowed.
Does this change the resistance outcome? The peak folks come with the standard equipment that they carry day to day. No Bat planes, or the like. It has to be person portable.
Do world politicians change their actions, if this occurs? Do the Polish people change - their resistance wasn't that much help to the Ghetto.