“If the howitzer breaks down, why not load the thing in a semi truck (they seem to have lots) and get on the road to Poland?”
J.C., you are incapable of learning.
“Why not load it on the back of a magic fairy unicorn, and fly it on pixie dust to Poland.”
Equally realistic.
Is truck. Gun fits in truck. Road is good (and they seem to be). All bridges are open (and they seem to be). Road is clear to Poland (or apparently Lithuania for the German ones). There are no Russians flying interdiction over the highways. Poles are friendly and engineers from everywhere are there at the depot, and if there are skills or parts wanted then that’s a problem the Americans (or French or British or Poles or...) can solve on their end. It’s good to have friends.
What magic American fairy dust is needed? Problems are there to be solved, not assumed into paralyzing appearances.