Via Starwars.com:

When Obi-Wan Kenobi got captured on Geonosis by the powerhouses of the Secessionist Movement, Mace Windu decided to lead a task force of 200 Jedi. Meanwhile, Yoda left for the Kamino system where the Republic would make use of the mysterious clone army that had been ordered about a decade ago by Jedi Master Sifo-Dyas. The participation of the Jedi on Geonosis would prove to be an omen of what the Clone Wars would bring for the guardians of peace and justice. The battle showed what the Jedi were and also what they weren’t. The Jedi were compassionate beings who didn’t hesitate to rescue a fellow Jedi in need and who did anything they could to protect the Galactic Republic. But the Jedi had evolved into diplomats and keepers of the peace instead of hardened battlefield commanders. The outcome of the Battle of Geonosis would be disastrous for the Jedi Order, as about 170 of the 200 Jedi would perish on Geonosis’ reddish soil. Let’s meet the valiant Jedi who joined Master Windu to Geonosis.

“This party’s over!”
Though Obi-Wan Kenobi had already been joined by his Padawan Anakin Skywalker and Senator Amidala in an unfortunate attempt to rescue him, Mace Windu was the first Jedi of the task force to reveal himself to Count Dooku and the leaders of the Confederacy. Master Windu reached Archduke Poggle the Lesser’s balcony by sneaking through the dark alcoves of the Petranaki Arena. He may have often thought about that moment when he had the chance to kill Dooku right away, but that wasn’t the way of the Jedi. Dooku warned Windu that the Jedi would be outnumbered when they entered the battle. Dooku did tell the truth as he unleashed hordes of battle droids and Geonosian warriors upon the Jedi.

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