▁exact ▁copy ▁of ▁Pom one , ▁being ▁built ▁to ▁British ▁design ▁standards ▁with ▁stronger ▁construction . ▁Sur pr ising ly , ▁End ym ion ▁sa iled ▁even ▁better ▁than ▁Pom one , ▁reaching ▁, ▁the ▁highest ▁recorded ▁speed ▁during ▁the ▁Age ▁of ▁S ail . ▁Rec lass ified ▁as ▁a ▁ 4 8 - gun ▁fourth - rate ▁fr ig ate ▁in ▁February ▁ 1 8 1 7 , ▁then ▁as ▁ 5 0 - gun , ▁and ▁finally ▁as ▁ 4 4 - gun ▁in ▁February ▁ 1 8 3 9 , ▁End ym ions ▁fine ▁qual ities ▁were ▁such ▁that ▁she ▁continued ▁to ▁be ▁pra ised ▁for ▁nearly ▁half ▁a ▁century . ▁She ▁was ▁finally ▁broken ▁up ▁at ▁P ly mouth ▁D ock yard ▁in ▁June ▁ 1 8 6 8 . ▁▁ 1 8 1 2 ▁Program me ▁Early ▁in ▁ 1 8 1 2 , ▁war ▁with ▁the ▁United ▁States ▁seemed ▁in ev itable . ▁To ▁co pe ▁with ▁the ▁heavy ▁American ▁ 2 4 - p ound er ▁fr ig ates ▁of ▁the ▁Constitution - type , ▁the ▁Admir alty ▁decided ▁to ▁build ▁a ▁batch ▁of ▁new ▁ 2 4 - p ound er ▁fr ig ates . ▁During ▁the ▁long ▁war ▁with ▁France , ▁the ▁standard ▁British ▁fr ig ate ▁was ▁of ▁about ▁ 1 , 0 0 0 ▁tons ▁and ▁armed ▁with ▁a ▁main ▁battery ▁of ▁only ▁ 1 8 - p ound ers , ▁no ▁match ▁for ▁the ▁big ▁US ▁ships . ▁The ▁only ▁proven