Bill:
Best I have been able to find out some members of the original Irwin Invincibles stayed in Company E, 25th Georgia Infantry after the reorganization. Many of the original members transferred to other Regiments ant their story is much better documented. Co. E of 25 Ga continued until the surrender.
I have posted "The Letters" on the web site for the 6th Ala Infantry since that is the unit Mike (Edward's older brother) originally joined.
There are still Huttos in Henry County. I went to school with several.
Regards
Gordon Holmes