Unit .Ini defence

Ok so it goes as follows:

Attack1
Attack2
Attack3
Defend

What is the 'Defend' For? While it sounds pretty obvious it does absolutely nothing to me yet i see many units with that option turned ON with FLC. It would be cool if units could actually use a defensive FLC like a lot of the tanks on the forums which use smoke yet i never got to see those animations in combat even when i increase the HP. Im only able to see attack 1-3.

Does anyone have an input on this?

Thanks

The defend animation has a certain possiblity to be played when an unit has 1 HP left and is still fighting.

Ahhh thanks...

Further reading:

what exactly does defend do..?

INI files: "defend"

What does Defend in the .INI mean?