5th 3rd Field is the 2nd of 3 ballfields named 5th 3rd. Before 5th 3rd Field in Dayton there was the 1st 5th 3rd located in Comstock Park and the 3rd 5th 3rd was built 2 years after, the 2nd 5th 3rd and is located in Toledo. Though this is the 2nd 5th 3rd, the 1st 5th 3rd wasn't originally named 5th 3rd, so this 2nd 5th 3rd was actually the 1st 5th 3rd.
(It's quite the controversy really).