Novamarines strike force at Battle of Geonosis.

[Tyzuris]

Assume a battle barge carrying three companies of Novamarines and detachments from the 1st and 10th companies totaling roughly 400 Novamarines + HQ + a few dozen specialists like Chaplains, Librarians, Apothecaries and Techmarines (and assume this is post-Primaris introduction so there are both Firstborn and Primaris Marines in this force) comes to orbit of Geonosis and replaces the Clone Troopers in the Battle of Geonosis.

They have a goal of saving the Jedi and taking out the political and military leadership of CIS before they have a chance of escaping.

And assume a bonus goal but not a necessary one which includes Novamarines capturing CIS leaders instead of eliminating them.

 

[Husky_Khan]

Hmm it's interesting. Four hundred Space Marines, but especially with the support of Librarians and Techmarines and the higher level Sergeants and Captains and the like could be a pretty credible threat to the Confederacy Leadership but I don't see them as being able to obviously win the War in the same manner that the Clone Army was. There were likely tens of thousands of battledroids on Geonosis and even four hundred Space Marines can't fight a war against all of them.

But combined with over two hundred Jedi, I think they could definitely take out the Arena and with the Jetpacks and Jedi leaping skills as well as precognition and Librarian Psyker senses, perhaps they could actually cut off and eliminate much of the CIS leadership before they can escape the immediate vicinity. Keep in mind in the original film a trio of gunships showed up to evacuate the Jedi trapped on the arena floor and then took them to the Marshaling Area.

Here, if they aren't planning on taking the surface planet, the Space Marines won't have to go to some "Marshaling Area." They'd show up in the Arena and begin smashing, not even giving time for the CIS to escape. And four hundred Space Marines plus other assets is far more firepower to bring to the Arena then three gunships with clonetroopers. Plus you still have multiple Jedi Masters including Yoda and Mace Windu along with the other named characters and Librarians/Captains who can take on Count Dooku who would be the main martial threat amongst the CIS leadership. The rest of them would likely be pushovers to capture or kill.