Two tombstones were erected for William at Yetter Cemetery.  Many years ago Warren Van Dine read the inscription on the marker placed by the family.  It was broken along date of death line.  His best determination is illustrated above.  There is also a military marker.

From the Muster and Descriptive Rolls compiled by the Illinois Adjutant General's Office:

Name   DUFFEE, ANTHONY W
Rank   PVT   Company K  Unit  51 IL US INF

Personal Characteristics
Residence   WEBSTER, HANCOCK CO, IL
Age 19   Height 5' 7 1/4"   Hair DARK   Eyes HAZEL   Complexion MEDIUM
Marital Status   SINGLE   Occupation   FARMER   Nativity   BALTIMORE, MD

Service Record
Joined When   JAN 16, 1862   Joined Where   WEBSTER, IL
Joined By Whom   CPT ROSE   Period   3 YRS
Muster In   JAN 20, 1862   Muster In Where   CHICAGO, IL
Muster In By Whom   N/A   Muster Out   N/A
Muster Out Where   N/A   Muster Out By Whom   N/A
Remarks   *

*A transcription of the remarks entry reads "DRUMMED OUT OF SERVICE AT CHICAGO ILL."  However, there is circumstantial evidence that Anthony drowned at Chicago in 1863.  And it's unlikely that the government would have provided a military tombstone for a man who had been dishonorably dismissed.

On October 21, 1882, Elizabeth Duffie filed for a pension based on Anthony's service.  Almost exactly ten years later, William Duffie, by then a widower, also sought a pension.  Neither request was granted.

Wm Duffy, 32, male, labourer, born PA
Elizabeth, 30, female, born MD
Martin, 8, male, born MD, attended school within the year
Anthony, 7, male, born MD, attended school within the year
Barbary, 3, female, born MD
Jno H, 2, male, born MD
Courtney, 8/12, male, born MD
Barbary Moyer, 58, female, born MD

William Duffie, 45, male, farmer, value of real estate 3000, value of personal estate 800,
born PA
Betsey, 42, female, born MD
Martin, 19, male, farmer, born MD
Anthony, 15, male, farmer, born MD, attended school within the year
Barbara, 17, female, born MD, attended school within the year
John, 13, male, born MD, attended school within the year
Courtney, 11, male, born MD, attended school within the year
[continued on next page]
Mary Duffie, 9, female, born MD, attended school within the year
William, 5, male, born MD, attended school within the year