@Gargantua:
Niether did the Invasion of Poland.
The typical German thing to do, was to attack between 2 and 4 in the morning. Whilst on the previous day, trying to come to “on the surface” conclusive peace talks.
It worked handidly in the favour, against the smaller countries.
Ironically, France and the UK (along with many other allied nations) declared war on Germany before Germany did. Not much happened for a while after that, though.