K, here's Oppugno again:
http://harrypotter.wikia.com/wiki/Oppugno
Oppugno is a spell that directs an object or individual to attack the victim. This curse will cause conjured creatures under the control of the caster to attack the target.
Shown in THBP, I might add.
The wizards can basically do what Vader did to Luke in ESB, hurl several items at them at once. Difference is these items will not just be flying, but actually attacking.
Soooooo the Jedi are gonna be surrounded by fiendfyre, they are gonna have shit flying at them from all directions (rocks, debris, broken glass, pretty much whatever a wizard wishes to employ Oppugno on), they are gonna have death spells and apparating wizards to deal with. Add on that Felix Felicis is in da hizzle AND the fact that the Death eaters can even turn civilians on the Jedi? Shiiiiiiiiiiiiit, bring on the Clones, the wizards Oppugno them and the Clones turn on the Jedi. It's order 66 all over again ✅ ......Confundus, confuse the Jedi, do all what I said above........Well......
Do the math.