Yu Jin Yuandi jian

The Yu Jin Yuandi jian 與晉元帝箋 (A Letter to Emperor Yuan of Jin) was a letter to Emperor Yuan of Jin, written by Liu Kun 劉琨.

Book of Shu 5 - Biography of Zhuge Liang
臣松之以為亮在渭濵，魏人躡迹，勝負之形，未可測量，而云歐血，蓋因亮自亡而自誇大也. 夫以孔明之略，豈為仲達歐血乎？及至劉琨喪師，《與晉元帝箋》亦云「亮軍敗歐血」，此則引虛記以為言也. 其云入谷而卒，緣蜀人入谷發喪故也.  