Hard Contact Chapter 1: Casualties of Geonosis

SCRAMBLE LINE ENCRYPTED

STAND BY STAND BY

GEONOSIS FORWARD CONTROL TO FLEET SUPPORT, ORD MANTELL.

PREPARE TO RECEIVE CASEVAC TRANSPORT. MED TRIAGE TEAM ESTIMATE SERIOUS INJURIES, TWELVE THOUSAND, REPEAT TWELVE THOUSAND. WALKING WOUNDED EIGHT THOUSAND, REPEAT EIGHT THOUSAND. ETA TEN HOURS. LOGISTICS PRIORITY FOR BACTA TANK SUPPORT TEAMS.

PREP FOR SEVENTY-TWO THOUSAND COMBAT-FIT TROOPS, REPEAT SEVENTY-TWO THOUSAND, PENDING REDEPLOYMENT. PRIORITY WEAPONS SUPPORT FOR COMMANDO UNITS.

THAT IS ALL. OUT.

Republic assault ship Implacable: inbound for extraction from Geonosis. Stand by.

 

Chapter 1 quote is a report post-Geonosis, where can get the estimated number of casualties the Republic suffered. According to the wookie (legends section), 192.000 clone troopers + 10.000 Clone Commandos + 6 Null ARCs were deployed in the battle. 
 

So according to RepComm and other sources cited in wookie the casualties were: 
- 12.000 seriously injured.
- 8000 trooper can walk it off.
- 72.000 remained battle ready.
- Rest of the troopers died.
- And out of the 10.000 Commandos, 4982 died in the battle.

Jango Fett personally handpicks 100 training sergeant to train the most elite part of the army, the best of the best, those who are supposed to exceed standard troopers. And they were wiped out in the Battle of Geonosis. Just like that. 
 

I was curious about the numbers of the Jedi causalties so I looked it up too. Roughly 200 Jedi participated in the battle. We know from the novelization of the AoTC that 100 Jedi was present with Mace Windu at the Arena battle, and only 20 survived + Windu. Jedi were even less prepared for a full-scale war scenario.
 

That’s how hard and unforgiving was the battle.