Brown's Island Explosion Marker

While researching the the State Department of Historical Resources Marker Program I came across this recent sign approval (July 2012) . . .

 "The 'Confederate Ordnance Lab Explosion relays the story of the massive explosion' in March, 1863 that destroyed the building on Brown’s Island that housed an assembly production for cartridges and other ammunition. The “ordnance laboratory and complex” employed many women and children and at least 40 people were killed in the explosion, which was set off when “worker Mary Ryan accidentally ignited a friction primer according to the marker."