Tiffany,
Woodward's Kentucky Battalion fell apart in January 1863 and some of the men could easily have just joined with Forrest at that time while some stayed with Woodward as he came back to the Kentucky/Tennessee area he was from to recruit his new regiment.
This can be checked by going through the Compiled Service Records available online at Fold3.Com or other sources. And of course George Martin is always of tremendous help here about these tings.
Greg Biggs