Hetzer, or Jagdpanzer 38, or Panzerjäger 38(t). The tank of defeat

So you've declared war on the whole world and you can't build proper tanks fast enough to keep the Red Army out of Prussia.

What do you come up with to slow down the enemy as much as possible, without actually changing the course of the war?

It's the tank that isn't a tank, the little armoured vehicle which no two tank nerds can even agree on the name of.