Cornyn was a physician and evidently a good one before he raised the 10th and became its commander. This book relates Cornyn's charges against his surgeon Feehan who was alleged to be in cahoots with Hynes and others outside of Corinth.
http://books.google.com/books?id=zMCBqphndWQC&pg=PA63&lpg=PA63&dq=major+hynes+court+martial&source=bl&ots=EeOd2k-Ca6&sig=rBZM1-iGM_qu0CxY1EHWe6uiGKE&hl=en&ei=7shYTY_MJ8eugQfa96iJDQ&sa=X&oi=book_result&ct=result&resnum=2&sqi=2&ved=0CB8Q6AEwAQ#v=onepage&q=major%20hynes%20court%20martial&f=false
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John R