acre , ▁and ▁it ▁was ▁the ▁last ▁regiment ▁to ▁leave ▁the ▁P ine ▁R idge ▁Res ervation ▁in ▁the ▁Winter ▁of ▁ 1 8 9 0 - 1 8 9 1 ▁following ▁the ▁mass acre . ▁ ▁Spanish – American ▁War ▁through ▁W W 1 ▁▁ ▁In ▁ 1 8 9 8 , ▁the ▁ 9 th ▁US ▁Caval ry ▁Regiment ▁fought ▁alongside ▁The odore ▁Ro ose vel t ' s ▁R ough ▁R iders ▁at ▁the ▁batt les ▁of ▁K ett le ▁Hill ▁and ▁San ▁Juan ▁Hill . ▁Later , ▁they ▁served ▁as ▁his ▁honor ▁guard ▁during ▁his ▁visit ▁to ▁San ▁Francisco . ▁ ▁In ▁ 1 8 9 9 ▁and ▁again ▁in ▁ 1 9 0 4 , ▁the ▁ 9 th ▁Caval ry ▁pat rolled ▁Y os em ite ▁National ▁Park ▁joining ▁other ▁caval ry ▁and ▁inf antry ▁as ▁the ▁first ▁" r angers " ▁of ▁the ▁park ▁system . ▁ ▁Under ▁General ▁John ▁J . ▁Pers hing , ▁the ▁regiment ▁fought ▁in ▁the ▁P un itive ▁Ex ped ition ▁against ▁Pan cho ▁Villa ▁in ▁Mexico ▁in ▁ 1 9 1 6 . ▁ ▁The ▁regiment ▁spent ▁World ▁War ▁I ▁in ▁the ▁Philippines . ▁From ▁ 3 ▁April ▁ 1 9 2 1 ▁to ▁ 1 1 ▁October ▁ 1 9 2 2 , ▁Brig ad ier ▁general ▁Edward ▁Anderson ▁commanded ▁the ▁regiment . ▁ ▁On ▁ 1 ▁March ▁ 1 9 3 3 , ▁the ▁ 9 th ▁Caval ry ▁was ▁assigned ▁to ▁the ▁ 3 rd ▁Caval ry