▁Black ▁River , ▁and ▁on ▁ 1 9 ▁May ▁ 1 8 6 3 ▁took ▁part ▁in ▁the ▁assault ▁at ▁V icks burg . ▁The ▁ 1 3 th ▁Regiment ▁was ▁the ▁only ▁Union ▁unit ▁to ▁plant ▁its ▁colors ▁on ▁the ▁Confeder ate ▁positions . ▁ ▁Following ▁the ▁Civil ▁War , ▁the ▁army ▁was ▁re organ ized ▁by ▁Congress ▁in ▁July ▁ 1 8 6 6 , ▁and ▁the ▁ 1 3 th ▁was ▁divided ▁into ▁three ▁reg iments , ▁each ▁batt alion ▁receiving ▁two ▁additional ▁companies ▁and ▁being ▁organized ▁along ▁traditional ▁lines . ▁The ▁ 1 st ▁Battalion ▁retained ▁the ▁design ation ▁of ▁the ▁ 1 3 th ▁Infantry , ▁while ▁the ▁ 2 nd ▁Battalion ▁became ▁the ▁ 2 2 nd ▁Infantry ▁and ▁the ▁ 3 rd ▁Battalion ▁the ▁ 3 1 st ▁Infantry . ▁ ▁From ▁ 1 8 6 7 – 7 1 ▁the ▁regiment ▁fought ▁in ▁the ▁Indian ▁Wars ▁in ▁Mont ana ▁and ▁North ▁Dak ota . ▁ ▁In ▁ 1 8 9 7 ▁the ▁ 1 3 th ▁US ▁Infantry ▁had ▁been ▁fil med ▁at ▁Fort ▁Jay ▁on ▁Govern ors ▁Island , ▁New ▁York ▁where ▁they ▁were ▁posted ▁in ▁the ▁years ▁before ▁World ▁War ▁I . ▁ ▁In ▁June ▁ 1 8 9 8 ▁the ▁regiment ▁was ▁sent ▁to ▁Cuba ▁and ▁led ▁the ▁ 1 st ▁Infantry ' s ▁attack ▁on ▁San ▁Juan ▁Hill , ▁capt uring ▁the ▁Spanish ▁flag . ▁ ▁Major ▁William ▁A uman ▁was ▁the ▁first ▁command ing ▁officer ▁to ▁reach ▁the ▁top ▁of