Matthew Marvin kept a bound diary of his experiences in the First Regiment from 1861 to 1864. He supplemented this diary with a "loose leaf' diary--single pages of text which is similar to the bound diary but sometimes added more information. On at least two occasions, entries were made in the bound diary which were written probably during and after the battle of Gettysburg. One of these entries is on the May 19, 1863 page. There is a note probably written by Alfred Carpenter requesting Marvin to notify his brother in case of his (Carpenter's) death and to send his diaries to his mother who was living in Madison, Wisconsin. A second entry written by Marvin on the May 18, 1863 page describes the burial place of Captain Joseph Periam, who was wounded severely during the charge of July 2 and subsequently died July 17, 1863.
The diary entries from Matthew Marvin's diaries prepared for this web site manuscript section begin with May 18, 1863. Some entries are not included at this time but will be when they are transcribed.
A brief biography of Marvin is on his page.