I found Brant's primary source here : https://www.fold3.com/image/228729475

What I find interesting is the reference by the JAG that the 9th Kansas Volunteers were illegal in 1861/62 thus "don't exisit". That appears to have been taken to heart by the US Army as there is no official record of the unit until 1864 when it was "called up" for Prices raid, even on the KS National Guard history site. I also don't find where the Cass Co Home Guards were ever federalized yet members got pensions and headstones post war. I suspect they were an embarrassment to the Union Army leaders but their ruthlessness and aggressiveness suited their purpose with "plausible deniability"

Walley was born in Ohio, found with parents in Grundy Co IL 1850
Name: Ervin Walley
Gender: Male
Age: 16
Birth Year: abt 1834
Birthplace: Ohio
Home in 1850: Saratoga, Grundy, Illinois, USA
Attended School: Y
Line Number: 3
Dwelling Number: 1
Family Number: 1
Household Members:
Name Age
Geo Walley 39
Elizabeth Walley 36
Ervin Walley 16
Almira Walley 11
Alwin Walley 2
Silas Walley 0

1855 is the reported migration to Bates Co and he is found there in 1860
Name: Irvin Walley
Age: 26
Birth Year: abt 1834
Gender: Male
Birth Place: Ohio
Home in 1860: Charlotte, Bates, Missouri
Post Office: Marvel
Dwelling Number: 527
Family Number: 529
Occupation: Farmer
Real Estate Value: 1000
Personal Estate Value: 1524
Household Members:
Name Age
Irvin Walley 26
Alven Walley 13
Emma J Walley 6
Ezekiel Blankenaht 16
He is married in Kansas to Mary E Long and Kansas census in 1865
Name: Irvin Walley
Gender: Male
Marriage Date: 31 Aug 1864
Marriage Place: Miami, Kansas, USA
Spouse: Mary E Long
Film Number: 001521943

Name: Irvin Walley
Census Date: 18 Jul 1865
Residence County: Linn
Residence State: Kansas
Locality: Valley
Birth Place: Ohio
Family Number: 286
Marital status: Married
Gender: Male
Age: 31
Birth Year: abt 1834
Household Member(s):
Name Age
Irvin Walley 31
Mary E Walley 18
Salley Long 16
John H Mills 22

Found back in Missouri in 1870 wealthy!
Name: Irvin Walley
Age in 1870: 36
Birth Year: abt 1834
Birthplace: Ohio
Dwelling Number: 16
Home in 1870: Butler, Bates, Missouri
Race: White
Gender: Male
Post Office: Butler
Occupation: Farmer
Male Citizen over 21: Y
Personal Estate Value: 5000
Real Estate Value: 20000
Inferred Spouse: Mary Walley
Inferred Children: Birdie Walley
Bettie Walley
Household Members:
Name Age
Irvin Walley 36
Mary Walley 23
Birdie Walley 4
Bettie Walley
William Anderson 25

1880 still has him in Butler MO
Name: Irvin Wallis
[Irvin Walley]
Age: 47
Birth Date: Abt 1833
Birthplace: Ohio
Home in 1880: Butler, Bates, Missouri, USA
Street: Olive House
House Number: 6
Dwelling Number: 9
Race: White
Gender: Male
Relation to Head of House: Self (Head)
Marital status: Married
Spouse's name: Mary E. Wallis
Father's Birthplace: Ohio
Mother's Birthplace: Ohio
Occupation: Farming Out Town
Neighbors: View others on page
Household Members:
Name Age
Irvin Wallis 47
Mary E. Wallis 33
Burdsey Wallis 15
Alverda Wallis 11
Elba Wallis 9
Ethel Wallis 6
Ella Wallis 3

Probate in 1894 is here where wife Mary is appointed administrator of the estate
Name: Irvin Walley
Probate Date: 28 May 1894
Probate Place: Jackson, Missouri, USA
Inferred Death Year: Abt 1894
Inferred Death Place: Missouri, USA

She goes on to receive 480$ for services and goods provided to the cause by congress in 1898.

(Court of Claims. Congressional, No. 9215. Irvin Walley v. The United States.)
This case being a claim for supplies or stores alleged to have been taken by or furnisbed to the military forces of the United States for their use during the late war for the suppression of the rebellion, the court, on a preliminary inquiry, finds that Irvin Walley, the person alleged to have furnished such supplies or stores, or from whom the same are alleged to have been taken, was loyal to the Government of the United States throughout said war.
BY THE COURT. Filed Novomber 20, 1893.
II. Doc. 51-39
(Court of Claims. Congressional caso No. 9215. Mary E. Walley, administratrix of Irvin Walley,
deceased, v. The United States.)
STATEMENT OF CASE.
The claim in the above-entitled case, for uso and occupation of real estate by the military forces of the Uuited States during the late war for the suppression of the rebellion was transmitted to the court by the Committee on War Claims of the House of Representatives on the 15th day of July, 1892.
On a preliminary inquiry the court, on the 20th day of November, 1893, found that the person alleged to have been the owner of the property was loyal to the Government of the United States throughout said war.
The case has been brought to a hearing on its merits.
Charles and William B. King, esqs., appeared for claimant, and the Attornoy. General, by John G. Capers, esq., his assistant, and under his direction, appeared for the defense and protection of the interests of the United States.
The claimant in her petition makes the following allegations:
That the following property belonging to the deceased claimant, Irwin Walley, was taken from him by the United States Army, in the county of West Point, State of Missouri, for the use of said Ariny, to wit:
On or about September 15, 1861, United States troops under command of General Lano and other officers took possession of, used, and occupied for the said Army a double two-story brown-stone building, and lot, and continued to occupy the same until March 1, 1864, twenty-nine and one-half months, at $50 per month, making a total of $1,475.
The court, upon the evidence and after considering the briefs and arguments of counsel on both sides, makes the following:
FINDING OF FACT.
The reasonable rental value of the property of claimant's decedent during the time it was occupied by the military forces of the United States was the sum of four hundred and eighty dollars ($480), which does not appear to have been paid.
BY THE COURT. Filed January 24, 1898. A true copy. Test this 230 day of February, 1898. [SEAL.]
John RANDOLPH, Assistant Clerk Court of Claims.
2d Session.

Walley clearly profited from the war in terms of cash and real estate, going from $1000 net worth in 1860 to $25,000 just 10 years later!

His daughter in her Social Security Admin application lists him as Capt. I Walley so I presume his service and rank were a source of pride for his daughter/children.
Name: Captain I Walley
Gender: Male
Spouse: Mary E Long
Child: Ella Parksie Walley

She married Albert Charles Loker and died in California in 1952.

FWIW. John R