The Billies played their games at Williamsport High School athletic fields, now on the campus of the Pennsylvania College of Technology.
Halstead arranged for the Williamsport franchise to have a working agreement with the Detroit Tigers of the American League.
The Tigers took control of the franchise in 1947 and improved Bowman Field by spending $40,000 to repair flood damage and installing grandstand seats from Briggs Stadium in Detroit.
This was their second year of affiliation with Detroit Tigers, and it was the first time that the Eastern League team in Williamsport was known as something other than the Grays.
Lou Kretlow who would go on to play in the majors for the Tigers, St. Louis Browns, Baltimore Orioles, Chicago White Sox and the A's was named the league's Most Valuable Player.
Notable players and managers to pass through Williamsport during these years included, Jack Tighe, Schoolboy Rowe and Hall of Famer Jim Bunning.
The Tigers era ended at the same time when the team was once again aligned with the Philadelphia A's and the Williamsport Grays name was restored.
On July 31, 1962, the Phillies traveled to Williamsport and lost to the Grays 4 to 1 at Bowman Field in a mid season exhibition game.