The Grand Battle begins with the search for allies in the Northern Kindoms and ends in The Burning that will change all Owldom forever.Soren and his band are sent to the mysterious Northern Kingdoms to gather allies and learn the art of war in preparation for the coming cataclysmic battle against the sinister Pure Ones. Meanwhile, in the Southern Kingdoms, St. Aggies has fallen to the Pure Ones and they are using its resources to plan a final invasion of The Great Ga'Hoole Tree. With the future of all Owldom in the balance, the parliament of Ga'Hoole must decide whether or not to join forces with the brutal Skench and Sporn and the scattered remnants of St. Aggies who remain faithful to them. A great battle is on the

索伦和他的队伍被派往神秘的北方王国，收集盟友并学习战争艺术，为即将到来的与邪恶的纯种者的灾难性战斗做准备。与此同时，在南部王国，圣艾吉斯已经落入纯种者之手，他们正利用其资源计划对伟大的加胡尔树进行最后的入侵。由于整个Owldom的未来处于平衡状态，Ga'Hoole的议会必须决定是否与残暴的Skench和Sporn以及仍然忠于他们的分散的St.Aggies残余势力联手。一场伟大的战斗即将开始