I've read Fuller's book on Caesar too and tend to agree with lots of his assessments - but then Caesar isn't the only one to regularly put himself in trouble and show a flash of brilliance to get himself out of it - Hannibal did that when he got himself trapped by Fabius - and used the oxen to trick his way out of the pass!
Div is a great source for Caesar though, very well researched!
Div also says Scipio was a masterful besieger too and Hannibal was terrible at it - but that simply wasn't the case - for example, Scipio spent two years in Africa trying to capture Utica and failed, and didn't capture any other city either for that matter - which really does show how a well defended place can withstand siege - his criticisms of Hannibal is also not as well researched in that area - he did actually storm and take quite a few towns and cities - only the ones he didn't are noticed more, but then they had heavier garrisons in the thousands!
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