The Charles F. McKenna Collection contains diaries, personal papers, and published materials relating to McKenna's Civil War service. The materials date from 1861 to 1998 (bulk 1861-1913). The collection is divided into two series: Personal Papers and Published Materials.

The Personal Papers include McKenna's original diaries (1862-1865); bound photocopies of the diaries; transcriptions on CD-rom; McKenna's discharge papers; photographs of two generals; and a letter regarding the publication of Under the Maltese Cross, from Antietam to Appomattox, the Loyal Uprising in Western Pennsylvania, 1861-1865; Campaigns 155th Pennsylvania Volunteers Regiment, Narrated by the Rank and File. The Published Materials include two articles featuring McKenna's letters; a map of McKenna's travels; an issue of Civil War News; and Civil War sheet music.

Elements within the diaries suggest they may not have been recorded at the time of the war, but instead, written down at a later date. The loss of chronology and the absence of entries for large periods of time in 1864 hint at this. Several notes in the text also imply additions at another date. After the entry for June 23^rd, the following appears: "[N.B. Here my notes ceased, as well as my dates and for the remainder of June and July I will be obliged to record the dates as well as facts from memory][C.F. McKenna. Aug. 1863]." In a lengthy entry for November 30^th, an asterisk note reads, "Have since learned that it was Genl. Warren made this report to Genl. Meade." At the very least, it appears additions were made to the diaries over time.

Additional materials in this collection include two published titles which are cataloged and located in the Rare Book Collection, a Tower rifle and bayonet, and a Solingen cavalry saber. See the "Separated Materials" section of this finding aid (below) for further information.