Proving Grounds should be as well a possibility. Here the link-adress:
http://www.the-proving-grounds.com/
If You give me more detailed info how the battles should be I could try to make some battles for maps I have created. But You would need another opponent then since I would know the parameters/conditions/troops/times etc. better then You. Because I take it You would like to play blind - without checking on who has what. Otherwise who would hinder You to change any scenario to Infantry-Only-Scenario by deleting all other forces and adding what You think right?
Greetings