Book XXI of Livy's history of Rome is one of the most frequently read either in its entirety or in extracts, for it includes Carthaginian campaigns in Spain and Hannibal's momentous crossing of the Alps to invade Italy.
P.G. Walsh's edition is designed specifically for use by students at A-Level. The commentary explains points of historical and literary importance, and elucidates grammatical peculiarities and passages of unusual difficulty. The introduction sets Livy in the context of Roman historiography as a whole, and deals in particular with Book XXI. There is a full vocabulary as well as an index of names and illustrative maps and plans.
Titus Livius (Patavinus) (64 or 59 BC – AD 17)—known as Livy in English, and Tite-Live in French—was a Roman historian who wrote a monumental history of Rome and the Roman people – Ab Urbe Condita Libri (Books from the Foundation of the City) – covering the period from the earliest legends of Rome before the traditional foundation in 753 BC through the reign of Augustus in Livy's own time. He was on familiar terms with the Julio-Claudian dynasty, advising Augustus's grandnephew, the future emperor Claudius, as a young man not long before 14 AD in a letter to take up the writing of history. Livy and Augustus's wife, Livia, were from the same clan in different locations, although not related by blood.
A good edition of the first book of Livy's history of the Hannibalian War, which I found useful while translating the Latin to English on the LatinStudy list (see https://www.quasillum.com/study/latin...). I spotted only one error: Hannibal marched north along the west bank of the Rhône, not the east bank (p. 34). There's a 42-page introduction, a clean text, extensive notes, and (unusually) a Latin-English vocabulary. And now on to Book XXII....