I ran a game of Ridgeway many, many years ago in 15mm. I used 'Soldier's Companion' miniature rules from GDW's RPG Space 1889 line and it went fairly historical, other than the QOR did not form square at the site of Fenian cavalry.
The following is information that I gathered way back when doing some serious research, including communicating with the CSM of the QOR of C at that time of my research, who provided me a wealth of information. Use it if it helps.
Booker's Column
Lt. Col. Alfred Booker, 13th Hamilton Battalion, Canadian Militia, Commanding
2nd Battalion, Queen's Own Rifles (Militia)- 450-480 men
Major Chas. T. Gillmor, Commanding
Coy. 1, Capt. John Brown
Coy. 2, Capt. Fredrick E. Dixon
Coy. 3, Capt. J. B. Boustead
Coy. 4 (1st Merchants'), Capt. John Douglas
Coy. 5 (2nd Merchants'), Capt. John Edwards (armed with Spencer carbines that they received that morning and only 30 rounds per man were available)
Coy. 6 (Victoria Rifles), Capt. G. M. Adam
Coy. 7 (Civil Service), Capt. A. MacPherson
Coy. 8 (Trinity College), Capt. L. P. Sherwood
Coy. 9 (University), Acting Capt. George Y. Whitney
Coy. 10 (Highland), Capt. John Gardner
13th Hamilton Battalion (Militia)- 265 men
Major James A. Skinner, Commanding
Coy. 1, Capt. Robert Grant
Coy. 2, Capt. John H. Watson
Coy. 3, Lt. John W. Ferguson
Coy. 4, Lt. Percy G. Routh
Coy. 5, Capt. Alex H. Askin
Coy. 6, Ensign W. Roy
Caledonia Independant Rifles Coy.- 48 men
Capt. William Jackson
York Independant Rifles Coy. – 45 men
Capt. Robert H. Davis
Irish Republican Army
Col. John O'Neill, 13th Tenn. Inf. Rgt., IRA, Commanding
7th New York (Buffalo) Inf. Rgt. – 165 men
Col. John Hoy
13th Tennessee (Nashville) Inf. Rgt. – 85 men
Unknown XO, Commanding
17th Kentucky (Louisville) Inf. Rgt. – 110 men
Col. Owen Starr
18th Ohio (Cleveland) Inf. Rgt. – 165 men
Col. John Grace
Independent Indiana(Terre Haute)Company – 75
Capt. Hugh Haggerty
Mounted Scouts – around 20-25 men
Unknown commander