Here’s the history:
The USSR and Germany sign a pact; on Sep 1 the Nazis invade from the West. The Brits declare war but do nothing.
On Sep 17 the Soviets invade from the East, as previously agreed to and not from ‘sensing opportunity’. The Brits do nothing.
So Britain’s guarantee meant -as Patrick Buchanan pointed out - nothing. I wouldn’t have had the Brits invade Germany. That is, I would not have given the Polish gvt any guarantees, either. After all, they knew in advance that the “logistics would have been Godawful, the overall strategy unwise and the north coast corridor of Poland was ethnic German bordered by Germany on one side and Prussia on the other” So why the guarantee? What was the point? How did it change the Polish government’s behavior, except for the worse in that they assumed they had an ally.
So the declaration of war was a sham.
that is blatantly false and it goes downhill from there.
Hell, the RAF attacked the German navy just days after declaring war which was just days after Germany attacked Poland....can you imagine the US being able to get moving that quick?
Within a month Brit troops were in Belgium and later France...and so forth. There was simply no way for Britian attack Germany directly in Poland and it would have made little sense anyhow.