Some rare color footage there.
Clips like this one reinforce the myths of Blitzkrieg-efficiency and general German technology superiority though: While it is true that Germany had motorized army units, (comparatively light) tanks (those Blitzkrieg tanks had nothing in common with later Tiger and King Tiger behemoths which were defensive mobile gun platforms more than offensive tanks) and Stukas, the vast majority of the German Wehrmacht were still an army on foot, bicycles and, yes, horses, it's just not what the German propaganda film teams depicted.
And it is not that the German offensive in Poland was without blunders, it's just that the Polish army leadership blundered even more as it was entrenched (no pun intended) in WW I tactics (as most other European nations were, especially the French) whereas Germany had taken the lesson from WW I that (1) you either win fast or you don't win at all, (2) there is no man-built defense line, however well armed, that cannot be overcome by a flexible attack (as Germany would later experience on D-Day and later at the Siegfried Line).
I always wonder what would have happened had the attack on Poland turned into a long drawn-out war with heavy German losses (which would have required massive Western Allies ground intervention there and Russia at least standing by). I'm not sure that Hitler's appetite for further western adventures would then have been sufficiently wetted, the German population - the World War I debacle was only two decades over - was extremely wary of the attack on Poland (no one in the Reich believed the "repeated border incidents"-scam) and the Nazis worried about morale should the war not prove a very quick success. As it was, the swift victory created an aura of invincibility of a military force that - with the exception of U-Boats - had no long range capabilities whatsoever. Come Dunkirk/Battle of Britain, North Africa and, later, the attack on Russia, that became painfully evident.
