"

 It is called a war in Poland. 
 It took place in September and October
 Sure, there's a guy who started a campaign of changing all instances where other names were used to this bizarre September Campaign, even though there was no double redirect there. But why do you write about it instead of changing your ways?
 I do not plan to move this article to Polish Defensive War as I doubt such name would gain much support. I'd rather hold a poll to determine what's more popular: invasion of Poland, Polish campaign, Defensive war, any would do - and all are actually used. Feel free to start it, but until then please refrain yourself from further reverts. Or at least start writing articles instead of simply changing names to the ones you like. Please. //tt "