Are you kidding me? The Germanic tribes were a huge threat to the Roman Republic.
Well yes but more a constant threat than a huge threat because:
A) The majority of Roman leaders had to deal with the northern tribes at some point over a long period of time
B) The Germanic tribes, though fierce, were essentially barbarians who were not adept at planning strategic takeovers and certainly not sieges
The battle of Arrusio in which over 100,000 Roman and Roman auxiliaries perished was the worst defeat in the History of Rome (both the Republic and the Empire).
Worst in numbers but add context, the battle of Cannae was more of a concern to Rome because Hannibal's goal was the conquest of Rome and he could try and starve Rome's supplies while Germanic tribes were too disorganized.
Fabius Maximus Truncator (The Delayer) was certainly a great general and his tactics were succesful to a degree (to this day scorched earth tactics are called Fabian tactics) but he was still unable to defeat Hannibal. It was Scipio Africanus who eventually implemented the strategy that defeated Hannibal and Carthage.
Would Scipio have defeated Hannibal without Fabius previous strategy? Again he was facing Hannibal's army that was 15 years older and weary from Fabius harassing it for so long.
I think the battle of Zama was not a hard battle at all (why else did Carthage start by negotiating terms in favor of Rome?), a lot of Hannibal's army at that time was Italians pressed into forced service and his veterans were old.
I will say this. If I could expand this thread to include all generals of the ancient world, Hannibal would have been my pick as #1.
Completely agree, he was exceptionally brilliant with his strategies in using his different pieces and the battle site's geography and an incredible leader in battle.
As for the Numidian war. Sulla was Marius's legate and under Marius's orders so the credit for the capture of Jagurtha belongs to Marius and not Sulla.
LOL, come on, Sulla persuaded King Bocchus to hand over and betray Jugurtha. Yes Marius tried to take credit because Sulla was his quaestor but it was Sulla that had the diplomatic tact to pull it off and whose ass was on the line.
In any event, I don't really look on this as something that makes a great general but more a great politician/negotiator.
I think you sell short the impact of Marius's reforms. It didn't really make the Legions larger. The combined force of Arrusio that went down to defeat was larger by far then any force that Marius or Caesar ever led. The main impact of Marius's reforms from a strategic stand point and you cannot emphasize enough how critically important this was, is that he profesionalized the legions which made them vastly more efficient then they had been prior to the Marian reforms. I think you underestimate also how difficult it was for Marius to implement his reforms and the bitter and intransigent opposition he faced in order to implement them. Had not Rome faced imminent destruction at the hands of the Germanic hordes then the oligarchy would have resisted Marius's reforms to the bitter end and probably would have won out.
No, no, I don't sell them short at all, it's just you asked who was Rome's greatest
general and so I judge that based on war/defence or the things that usually make up a general NOT reforms and such which are the points of what makes a great political leader - which I admit Marius certainly was.