Greg, the only account of the drowning incident that I am aware of, and it is quite detailed, comes from the memoir of William Brock Judkins of Company G, 22nd Georgia. The memoir was online at one point, and is also found in the archives of the US Army Military History Institute in Carlisle, PA. Some of the individuals who drowned are also mentioned in the militaryhistoryonline.com database under the 22nd Georgia. Incidentally, on a related matter, last night I reviewed an account by John B. Linn, a former soldier who visited Gettysburg a few days after the battle. He writes of seeing the 22nd's Colonel Joseph Wasden's grave being marked by the masonic symbol of square and compass. The grave is also identified on Elliott's map as being just south of the Nicholas Codori barn and just east of the Emmitsburg road. The marker was no doubt carved by one of the four or five fellow Freemasons of the Federal army who attended the burial, which included Captain Thomas Foy and Corporal Stalker of the 2nd Rhode Island. The burial occurred on 4 July when that regiment was posted nearby, and sporadic skirmish firing was still taking place as the Confederates did not retreat from their lines on Seminary Ridge until evening.