On May 3, 1863, the day that Col. Purdie died, the flag of the 18th North Carolina was captured by the 7th New Jersey at the Battle of Chancellorsville. It is currently on display at the North Carolina Museum of History in Raleigh.
At the Battle of Chancellorsville, the 18th lost 34 killed, 99 wounded and 21 missing.
The NC Museum of History had this press release June 18, 2008 which also included pictures of the front and back of the 18th's flag.
It was captured May 3, 1863, when the regiments color-bearer, Corporal Owen J. Eakins of New Hanover County was killed.
Its existence was not known until Dr. Tom Walsh, a New Jersey college professor wrote the museum a letter. He had gotten it in the 1970s and it is believed it had several owners before that.
He loaned it to the museum which conserved it and put it on display in 1993. He then offered to donate part of the value of it and the museum paid the remainder of it. It is currently on display in "A Call to Arms: North Carolina Military History Gallery."
Fly That Flag!! --Old B-Runner