The game of Base Ball played at Gamble Lawn on yesterday, between the Union and Empire Base Ball Clubs, resulted in the complete victory of the former. The score was as follows: [Union 53, Empire 15.]
The game was played for the Championship.
-Missouri Republican, May 15, 1862
This appears to have been the first game of a championship series and while I don't have a lot of details about the series, I do have a reference to another game in the series being played in November. It had to have been at least a three games series and could have been a best of five. However, since I only have references to two of the games, I can't say for certain.
The big take-away from this is that baseball in St. Louis had evolved to the point where clubs were organizing a competition to determine a champion. I think that's a major step forward in the growth of the game in St. Louis and shows that baseball was moving beyond its social club stage and towards the open competitiveness that would dominate the post-war period. St. Louis was moving beyond the "fun" stage and towards the "winning" stage. Baseball was evolving into a modern sport and this match between the Empires and Unions shows that.
One thing that just kind of dawned on me when I was looking at the box score is that Jeremiah Fruin was not playing for the Empire Club at this time. As far as I can tell, Fruin did not play with the club in 1861 either. I know that Tobias said he was playing with them in 1861 but I think he was wrong about that. Taking a quick look at my notes I don't have any contemporary evidence of Fruin playing with the club until 1865. I don't know. We'll see.