烏漏社在晚清的光緒年間，因為抗官事件而遭到清帝國官軍的攻擊，其後的戰火更延燒至東海岸，造成大港口附近阿棉山、納納等社勢力瓦解。但從日治時期以來，在所謂的「奇密社事件」、「大港口事件」故事的掩蓋下，「烏漏事件」逐漸被遺忘，甚至是消失了蹤影。本文試圖藉由歷來官方檔案、口述歷史、研究文獻等，探究這場被遺忘的戰役，一方面檢視事件發生的可能原因與背景，一方面也探索這場戰役所帶來的影響。

The Orau tribe was attacked by the troops of Ching Empire due to their protests against the officer during the Guangxu era of the late Ching Dynasty. This battle extended to the Eastern coast of Taiwan also vanished the forces of the Amisan and Lavlav tribes in the area of Dagangkou. However, in the Japanese colonial period, this "Orau incident" covered by "Kiwit incident" and "Dagangkou incident" was lost in the history. In order to recover this important incident, this study attempts to discuss the possible causes, backgrounds and influences of this battle by literature review and oral histories research.