My first battle with around 1700 sassanids and 1000 white huns and result was, I lost. The moment I started I peaced out an arab nation that I was at war with and went on to neutralize the white huns threat, I start with 4 armies arond 14-16 units strong each and took three armies to face white hunnic army, after 6-7 turns I catch one of those army and man white huns are tough. So basically I started a campaign with Sassanids and well it din't went well.