The beginning of the story reveals the Trojans have already set out on their mission: to found a new home in Italy.
Due to its torridness and passion, Aeneas's fling with Dido runs the risk of distracting him from his main task.
This means yet another obstacle that will need to be met before Aeneas can go snap digital photos of the future site of the Roman forum (currently filled with cows).
It turns out that all Aeneas needed to do in the underworld was receive a motivational pep-talk. Now he's all good to go for some butt-kicking in Italy.
This is the moment when Aeneas's plan seems most in danger of not being carried out – or at least being really, really messy.
By killing Turnus, Aeneas decisively removes the last obstacle standing between himself and his new life with Lavinia as king of the Latins and Trojans.
One of the most striking features of the Aeneid is that it ends simply with Turnus's soul heading down to the underworld in anger. We never get to see how things play out – whether Aeneas and Lavinia are happy together, etc. In fact, this lack of a tidy ending so annoyed readers in the Renaissance that a few Italian writers tried to write their own conclusions to the poem.