Alexander Biddle was a member of the prominent Philadelphia Biddle family and was married to Julia Williams Rush, the granddaughter of Dr. Benjamin Rush. Biddle served with the 121st Pennsylvania Volunteer Infantry, beginning in September 1862. Starting out as a major, he would participate in Fredericksburg and Gettysburg, among other engagements, and would leave the service as a lieutenant colonel. (He was commissioned, but never mustered, as colonel) 
Transcript (excerpt):
Camp near Belleplains Virg
Hear Qrs 121 Reg P.V.
March 18th 1863
Dear Julia
I am writing in my tent after retuning from Brigade did this afternoon from ½ past two to 5 Oclock I found on my return the long absent box with the 41 pair stockings [gridiron?] &c &c all in very good order for all which I was very grateful I also received one of our dear good Uncle’s letters gushing of you full of kindness to me You must thank him for it in my name I would answer it directly but that I hope he may so far indulge me as I have but little time with a good deal of writing yet to do to night and may not have time Tell Emily I have her letter of 16th and thank her for that If she will just say in a note to Clem or Tom that she would like to be made the guardian of the children either can hand it to George Biddle who has attended to all out legal business in court. I would however suggest to her that she should name her brother John Frank or Emlen and some one of us three brothers as associates with her in the Guardianship – they may have to give some security in Court for faithful discharge of duty but George could settle that part…
Citation: Alexander Biddle (1819-1899), autograph letters signed to Julia Williams Rush Biddle. 18 March1863. Rush IV:30:29
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