 Kọ itẹsiwaju fun paragirafi yii - Posey ni a gbega si ọmọ-ogun onisegun ni Oṣu Kini ọjọ 18, ọdun 1863, lati ṣe ipo lati Oṣu kọkanla 2, ọdun 1862. Ní oṣù May tó tẹlé e, ẹka ọmọ ogun Posey kò fi bẹẹ kópa nínú ogun Chancellorsville, wọn dúró ní ibi tí wọn ti ń ṣọ àwọn ọmọ ogun ní Salem Church : ó ṣe tán. Nigba isọdọtun ologun lẹhin iku Stonewall Jackson, a yan brigade Posey si apakan Major General Richard H. Anderson ti Ẹgbẹ Ẹkẹta A.P. Hills. Lakoko Ogun ti Gettysburg ni Oṣu Keje, brigade naa jẹ apakan ti ikọlu Anderson ti Oṣu Keje 2 lori Cemetery Ridge, ṣiṣe ailera, ikọlu ti ko ni ibamu ti a da pada. 