Summary of Canto: Inf XXXI

1-6     simile: Virgil's tongue, Achilles' lance
7-18    leaving Malebolge: the horn in the gloom (Roland) 
19-21   Satan's 'walled city': Dante's misperception
22-33   Virgil: soon you will see the cause of your error;
        let me tell you now: those are giants, not towers
34-39   simile: lifting mist
40-45   simile: Monteriggione
46-48   the first giant (Nimrod)
49-57   digression: nature's benevolent cessation
58-66   Nimrod's bulk, face to belly
67-69   Nimrod's words
70-75   Virgil's response: blow your horn
76-81   Virgil: Nimrod and the confusion of tongues
82-90   Ephialtes in chains
91-96   Virgil: Ephialtes and the assault on Olympus
97-99   Dante: and where is Briareus?
100-105 Virgil: unbound Antaeus is next; Briareus farther on
106-111 Ephialtes shakes with rage; Dante's fear
112-114 arrival before Antaeus
115-129 Virgil's captatio of Antaeus: his prowess; do not 
        make us proceed to Tityus or Typhon
130-135 Antaeus holding Virgil holding Dante
136-140 simile: the Garisenda tower of Bologna
141-144 Dante, fearful but safe, arrives on floor of hell
145     comparison: Antaeus as raised mast of ship