There were about 50 Williams, none with the name Thomas Davis or any thing similar. The 4th became the 27th in May of 1862 and was filled out during the summer transferring its Arkansas company and picking up 9 miscellaneous Texas companies. Though it is not known for sure if the last was filled out. The 27th coought it at Iuka and Hatchie Bridge in Oct. so was never at full strength. You can look at the full list of Williams at the web site below. Click on the Ross Texas Brigade and then master roster. Scroll down to Williams. You can look at the 27th by clicking on it and going to its rosters. Here you can find all the history that I have found. I always keep looking.