Stealing from the Siegesmiths

I'm tasked with the destruction of the Scarlet Onslaught's ballistae. Unfortunately, the apothecaries and I are at odds on the use of our resources, so I've nothing to destroy them with!$B$BTo the northeast are the Carrion Fields. The Scourge siegesmiths there at their forge and meat wagons are demolition masters.$B$BLuckily for us, they also leave their bombs lying about. $B$BI want you to retrieve them for me, off of the ground or the siegesmiths, I don't care which.