sentences:  The sport was at its peak in Wales in the 1930s, and is most popular in the cities of Cardiff and Newport.As a traditional bat-and-ball game, its roots go back much further, and literary references to baseball and rounders date back many centuries, the earliest mentions "base ball" being played in Britain in 1744.In recent years the sport has gone into decline, having once been able to attract crowds of 20,000, British Baseball is now a minority sport.