User blog comment:Fegaxeyl/Saving Poland/@comment-32656-20120525075644/@comment-257949-20120525090012

If it was 'heroic' enough and received enough coverage you'd generate support amongst the Americans and British. With the Americans Roosevelt could use a promise of guaranteed support for Poland after its success to get more votes. The UK general election would also get affected by this. I'm assuming a successful Market Garden leading to a shorter war, which would then cause various knock-on effects with the timing of the UK general election and, possibly, Yalta. If pressure is big enough, I imagine the 'percentages agreement' might be forgone in favour of an independent Poland.