That’s all true. And even if Britain and France has somehow been able to mount an invasion of Germany in 1939, by the time such an operation would have been ready, Poland would have still been overrun, and winter would be fast approaching. And with Germany having a stronger industrial base than either Britain or France in 1939 (or 1938 for that matter) the Germans would have been able to hold any plodding WWI-style invasion launched by those nations, until its greater resources were brought to bear. The only hope for a sucessful invasion of Germany even in 1938 would be if the Soviets decided to stab their beleagued ally in the back by invading—but they’d have to pass through Poland first, a tough job without Germany. And as for not declaring war on the USSR in 1939; the Soviets were seen as merely taking back those parts of Poland rightfully belonging to the Ukraine (they were populated mostly by Ukrainians and Jews, not Poles).
False!