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Dear Mr. Gray,
Thank you for contacting the History Hub!
We searched the Records of the Adjutant General's Office, 1762 - 1984 (Record Group 94) and located a series that includes the “Regimental and Company Books of the 12th Illinois Cavalry Regiment” from 1861 to 1867. The information you seek may be contained in the morning reports recorded in these books. For more information about the records and for requesting copies, please contact the Textual Reference Archive I Branch via email at firstname.lastname@example.org.
We hope that this is helpful. Best of luck with your research!