Assembling a SWAT team in rural South Carolina

Here is what the South Carolina Dept. of Corrections said about its 4-hour delay in responding to a prison riot in Bishopville, South Carolina on Sunday night.  Seven prisoners died and 17 were injured  in the melee.  Here's I'm quoting from the New York Times report by Richard Fausset: 

When the trouble started, Mr. Stirling [director of the South Carolina Department of Corrections] said later in a telephone interview, there were only two guards on duty in each of the three housing units, and they were armed only with pepper spray. Each housing unit holds about 250 inmates. 

Assembling an armed SWAT team in a rural area on a Sunday night takes time, he said.

Bishopville, population 3,238, is the county seat of Lee County, population 17,635, and is 40 miles from the state capital, Columbia.