I believe some glich has occurred and it may very well represent a closed paran.??

Try copying and printing and see that a closed paran. appears in place of the symbol.

7th Texas Cavalry—Lt. Col. Philemon T. Herbert Jr. (mortally wounded April

28th Louisiana Infantry—Lt. Col. William Walker (killed April , Maj. Thomas W. Pool

Second Brigade—Brig. Gen. Camille J. Polignac, Col. James R. Taylor (killed April , Lt. Col. Robert D. Stone (killed April

And then, in the case of the first two noted above, their CSMRs do not record their deaths!!