The list of three casualties may not be complete, but it's all we can obtain without examining the CSMRs.
M. F. McDonald
Residence was not listed;
Enlisted on 2/21/1862 as a Captain.
On 2/21/1862 he was commissioned into "M" Co. PA 12th Cavalry
He was Mustered Out on 3/21/1865
Promotions:
* 1st Lieut
* Capt 9/1/1863
Personnel from the 12th PA Cavalry who were killed in battle at Frederick, MD on 07/10/1864
Pvt. Frank H Gallagher, Pvt. John Griffith, Sgt. Augustus Singer [May not be complete]
Sources used by Historical Data Systems, Inc.:
- History of Pennsylvania Volunteers, 1861-1865
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See also: http://12thpacavalry.8k.com/