This page is a Concept of Imperia Online, and controlls a major part of the game, but is intangeable in the game and game surface coding.
Field Battles are one type of Battle in Imperia Online. They are battles fought without defensive bonuses. The Defending Army is the Standing Army of the Defending Estate. The Attacking Army is the Invading Forces. There are no bonuses of any sort, and Seige Units do not fight. The Field Battle must be won before the Fortress Seige can begin. Without a victory of the invading army at the Field Battle, the Fortress Seige doesn't begin.