Specs:

Celeron 466
512MB RAM
GeForce 4 MX440 64MB

Low enough?

Trebia battle unmoded:

Initial results (minimum settings): Average 3-5fps - Highest 9fps
Final results (after tweaking): Average 7-8fps - Highest 14fps

Not really playable with anything above 4 units in the field.

Does that answer your question?