“… Our Brig. Went into action in mass by batallion when the first or advance rigiment was ordered to fire they were to lay down then the 2nd march over them, fire and lay down, & so on. We did not commence fireing untill close to the masked battery“.
From the Friends of Resaca website, this article by W.F. Jenkins of the 19th Michigan describes how they were to advance. This illustrates one difference between a mock battle and a real one. Not only were they too mixed up and scattered to have proceeded this way (and no one said they had), Harrison’s 70th Indiana and the 105th Illinois literally ran ahead, leaving the others to catch up. Note that Jenkins’ regiment was in Coburn’s brigade, which had not even had the benefit of the mock battles that Harrison’s (Ward’s) brigade had undergone. (Text is as Jenkins wrote it.)