Felid 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 Feild Battle must be won before the Fortress Seige can begin. Without a victory of the invading army at the Feild Battle, the Fortress Seige doesn't begin.