Fun fact: around 2,000 Jedi showed up for that battle. 34 of them survived.
The first battle of Geonosis was the single worst military blunder of the entire Clone Wars for the Republic. They also had massive losses on the side of the clones, with entire companies being wiped out, primarily due to poor (Jedi) leadership.
@I Are Lebo, in everyone’s defense as far as that you took what basically amounted to glorified security guards and made them combat generals. It honestly was a massive tactical blunder to put the Jedi in charge of anyone during a galactic civil war. Could you have specific Jedi command as generals? Yeah, but veteran commandos were literally being out ranked by teenagers with poorly trained space magic and a glow stick.
@The Xenocide, to be clear I don’t hate on Star Wars with this. But it’s very much a lovely thing called “Suspension of Disbelief”. You throw certain logic or rules out the window for the sake of the story. It’s when that is stretched too far that you get massive push back from your potential fans and viewers. Every piece of fiction will use it to some degree and the better ones know how to make it work correctly.
@The Xenocide, to be fair, having bad leadership (on both sides) was more of a benefit to ol' Sheev. Reports of horrible battles would lead to more and more emergency powers granted to him
@I Are Lebo, well, I think the first major battles of many wars go badly for the side that doesn't really expect it. Plus killing Jedi was a big part of Palpy's plan
@The Xenocide, the thing you have to remember is that this was not a plot hole. Suspension of disbelief is not required. The battle was a disaster BY DESIGN. Palpatine made sure the bulk of the Jedi fighting force was present in order to wipe most of them out. This way, through the war, younger and younger padawans would be pressed into service and likely killed off. This was all a part of the plan.
In addition, the losses on the part of the clones instilled a deep resentment in many of the survivors against Jedi that they never got over, which is why so few clones resisted Order 66 when it was eventually sent out.
The Republic Commando video game goes into more detail on this. The majority of the Commandos were wiped out during that battle without ever getting the chance to be properly deployed (most of the blame for this is on Mace Windu specifically), and the remainder would hold that grudge until the end of the war and beyond.