As their final act before leaving Italy, Alfredo decrees that the Scotsmen must construct a haggis factory upon Mt. Vesuvius. The fact that it happens to be erupting at the moment is of no consequence.
More than most levels, Mt Vesuvius lends itself to the strategic use of elevation. The cliffs help to restrict enemy movement, and Scotsmen and towers will be able to get a good range bonus against enemies below. The summit in particular is high enough that a turnip turret placed there can fire at enemies almost anywhere on the map. It also has an oat field right next to the lava pool.
The main enemy spawn area is quite close to the player's starting position, but enemies coming from there will have to take a long, circuitous route around the narrow trails on either side of the mountain, while the player is free to take pot shots at them.
On the other side of the map are two caves from which enemies also emerge. These are closer to several of the oat fields, so they will pose a greater threat than the other spawn zone.
Being the last Italian level, Mt. Vesuvius also features the Italian Boss, Mussolini. Mussolini carries a deadly submachinegun, that can decimate anything that isn't well covered, including most towers. The player had better keep a strong front line of oat bag barricades to hold him off, while longer ranged towers fire at him from a safe distance.