Conversation so far:
What did James Buchanan do in James Buchanan's final years?
The Civil War erupted within two months of Buchanan's retirement.
How did that effect him?
He supported the United States, writing to former colleagues that "the assault upon Sumter was the commencement of war by the Confederate states.
What was the response to his support?
also wrote a letter to his fellow Pennsylvania Democrats, urging them to "join the many thousands of brave & patriotic volunteers who are already in the field".

Question: What did he do after that?
Self-contained rewrite: What did James Buchanan do after showing his support for the United States in the Civil War?