> I am working on a little skirmish, Britton's Lane, Sept > 1862. If you have any accounts from the 20th or 30th I
> would be very much interested.

I assume you've seen G. B. McDonald's account at http://home.comcast.net/~30il/mcdonald.html#K

Have you read "I Marched With Sherman" by Ira Blanchard?

Interestingly, he claims that the 30th and 20th Illinois, falling into disorder from the repeated cavalry charges, were able to form a massive hollow square that saved the day.