Help with signature

[Saruman]

Hi, I was wondering if anyone could decipher what is written below John C. Pemberton's signature here? Apparently it is his pre-war rank in the US Army.

My guess is Brevet Captain 4th Artillery? Do you think that's correct?

 

[ErnieMac]

Pemberton was breveted Captain on September 23, 1846, for conduct at Monterrey and breveted Major on September 8, 1847 for conduct at Molina del Rey. Those are the dates of record, when Pemeberton received notice of them I cannot say. Commission as full Captain of Artillery occurred September 16, 1850.
http://penelope.uchicago.edu/Thayer...d_States/Army/USMA/Cullums_Register/917*.html