First was Osprey Campaign #299: Zama 202 BC: Scipio Crushes Hannibal in North Africa which dug pretty far back into Rome/Carthage history before dealing with the battle itself. Not bad.
Then I read Osprey Campaign #285: Lewes and Evesham 1264 - 65: Simon de Montfort and the Baron's War, a bit of English history. Having heard a few podcasts about this period and to a lesser extent this battle, I found the book filled in a few gaps for me, so again not bad.
Next was Osprey Campaign #286: Catalaunian Fields AD 451: Rome's Last Great Battle, another one that had been foreshadowed for me by podcasts which was fine. Pretty solid read.
Finally, Osprey Elite #213: The Barbary Pirates 15th - 17th Centuries which was especially interesting in that it deals with a subset of pirates that our media rarely deals with. I liked this one very much.