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| Item | Date | Location | From | To | Description |
| Letter 1 | May 12, 1861 | Keokuk, Iowa | brother Joseph McClelland | John McClelland | John's brother describes his trip from home in Cedar Rapids to Keokuk, Iowa, where his 1st Iowa Infantry is forming up; heavily loaded boat on Mississippi River; attends church, sees brass band. |
| Letter 2 | November 24, 1861 | Camp Tiffin, near Wooster, Ohio | John McClelland | wife Rachel | Cold & snowy in Camp Tiffin; Uncle Joseph buys dinner for him and fellow soldier Newt Gorsuch; affections to his little girls; what to do with the sow, pigs and oats; hand drawing of John McClelland and his military tent. |
| Letter 3 | November 28, 1861 | Camp Dennison, Ohio | John McClelland | wife Rachel | leaving camp Tiffin; description of busy Camp Dennison, barracks; body lice |
| Letter 4 | December 11, 1861 | Camp Dennison, Ohio | John McClelland | wife Rachel | description of soldier's diet; instructions on business affairs at home; telling about the sickness in camp; description of guard duty and avoiding the sick. |
| Letter 4b | December 15, 1861 | Camp Dennison, Ohio | John McClelland | wife Rachel | received dress uniforms and parading; informed of upcoming move to Kentucky; preparing for war; notes to children |
| Letter 5 | January 10, 1862 | Camp Clay, Ohio near Pendleton | John McClelland | wife Rachel | rumors of battle at Bowling Green, Ky; issue of ammunition; description of duty as orderly |
| Letter 6 | January 26, 1862 | Somerset, Ky | John McClelland | wife Rachel | camp life, cleaning guns, inspections; describes daily rations; plans for regiment to go to Knoxville, Tn, via Cumberland Gap; sees horses from Confederate General Zollicoffer's troops just defeated at Mill Springs; tells Rachel about his dream of being home. |
| Letter 7 | February 8, 1862 | London, Ky | John McClelland | wife Rachel | Preparing to march on Cumberland Gap; 45 miles of hardships |
| Letter 8 | February, 1862 | unknown | John McClelland | wife Rachel | letter fragments: sends children Valentines; Major makes note of his large belly. |
| Letter 9 | February 16, 1862 | encampment on Cumberland River, Ky | John McClelland | sister-in-law Jane Lockhart | 18 miles from Cumberland Gap; Union cavalry captures some Rebels; anticipation of battle; describes meager rations and hunger. |
| Letter 10 | February 25, 1862 | encampment on Cumberland River, Ky | John McClelland | wife Rachel | describes camp being flooded; money sent home |
| Letter 11 | March 6, 1862 | Camp Cumberland, Ky | John McClelland | wife Rachel | closer to The Gap; river floods; Rebel force increases; two burials; measles; sent money home via express |
| Letter 12 | April 15, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | a probe toward "The Gap"; pickets , a moldy slapjack and fresh "pone"; anticipating the battle |
| Letter 13 | April 19, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | "full of fight ..and crackers"; Newt Gorsuch reported "fat as a china pig"'; dinner with Major Kershner; half rations due to bad roads |
| Letter 14 | April 25, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | out of provisions; trip to Flat Lick for food; a Colonel promoted to General?; assigned as courier for the new General |
| Letter 15 | May 4, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | Colonel (DeCourcey) gives his couriers a Sibley tent; how to avoid bedbugs; answering to the General's silver whistle; good food from the General's cooks;; John's wife being pursued?; finding a husband for sister Jane; the brigade's beautiful drill; |
| Letter 16 | May 14, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | Colonel's orderly; full brigade drill; paymaster coming; sister Jane wants to see a battle |
| Letter 17 | May 21, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | 22 cannons; attack on Cumberland Gap tomorrow; has a horse to write and will stay close to the General |
| Letter 18 | June 5, 1862 | Cumberland Ford, Ky | John McClelland | wife Rachel | scouting with the General toward the Gap; capture of a kitten; riding five miles for milk each day |
| Letter 19 | July 13, 1862 | Cumberland Gap, Tn | John McClelland | wife Rachel | health is failing; sending money and a "miniature" to wife with Lt. Liggett; losing weight. |
| Letter 20 | July 30, 1862 | Cumberland Gap, Tn | John McClelland | wife Rachel | recovered from sickness; describes contents of box of "provisions"; sent home picture of himself made at Cumberland Gap; brought milk by two little girls while sick in hospital |
| Letter 21 | August 8, 1862 | Camp Virginia, Cumberland Gap, Tn | John McClelland | wife Rachel | John McClelland describes The Battle of Tazewell, Tennessee; capture of a Confederate Colonel; death of his Captain, Joseph Edgar; lists names of missing soldiers he knew; last known letter from Private McClelland |
| Letter 22 | December 5, 1862 | Memphis, Tn | Josiah Martin | Rachel McClelland | John's friend writes to Rachel about John's illness, taking medicine, bed under a shade tree, riding away in ambulance, getting sicker, money matters; John in hospital too weak to speak. |
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