▁design ▁for ▁a ▁suitable ▁ 2 4 - p ound er ▁fr ig ate ▁was ▁that ▁of ▁End ym ion , ▁and ▁in ▁May ▁ 1 8 1 2 ▁two ▁ships ▁were ▁ordered ▁from ▁W ig ram , ▁Well s ▁& ▁Green ▁of ▁Black wall ▁Y ard , ▁who ▁were ▁to ▁construct ▁all ▁five ▁ships ▁eventually ▁built . ▁They ▁differ ed ▁from ▁the ▁prototype ▁by ▁being ▁constructed ▁of ▁" fir " ▁( act ually , ▁pitch ▁p ine ) ▁rather ▁than ▁o ak , ▁and ▁mounted ▁an ▁extra ▁( four teenth ) ▁pair ▁of ▁ 2 4 - p ound er ▁guns ▁on ▁the ▁upper ▁deck ▁forward . ▁All ▁would ▁be ▁rec lass ified ▁as ▁ 5 0 - gun ▁fourth - rate ▁fr ig ates ▁in ▁February ▁ 1 8 1 7 ; ▁however , ▁the ▁use ▁of ▁soft wood ▁in ▁their ▁construction ▁was ▁such ▁that ▁they ▁were ▁only ▁intended ▁for ▁a ▁short ▁lifetime , ▁and ▁indeed ▁all ▁five ▁were ▁taken ▁to ▁pieces ▁after ▁a ▁few ▁years ' ▁service . ▁ ▁The ▁first ▁pair ▁were ▁originally ▁ordered ▁on ▁ 4 ▁May ▁ 1 8 1 2 ▁as ▁Tag us ▁and ▁Er id anus ▁of ▁the ▁ 1 8 - p ound er ▁armed ▁, ▁but ▁were ▁renamed ▁on ▁ 7 ▁January ▁ 1 8 1 3 ▁as ▁ ▁and ▁. ▁The ▁War ▁of ▁ 1 8 1 2 ▁broke ▁out ▁in ▁June , ▁and ▁on ▁ 2 6 ▁December ▁two ▁further ▁ships ▁were ▁ordered , ▁becoming ▁ ▁and ▁. ▁The ▁final ▁ship