Saudi Arabia/GCC forces number 10,000.

via Arabnews.com

Emirati and Bahraini soldiers who were “martyred” in Yemen will be treated as Saudis “materially and morally,” said Deputy Crown Prince Mohammed bin Salman, SPA reported on Tuesday.
He vowed that the blood of “our martyrs will not go in vain,” and added that “the (Saudi-led) coalition will continue its operations with determination to defeat the (Houthi) rebels and their supporters who tampered with the future of the brotherly people of Yemen and who tried to destabilize the region.”
The Iran-backed militia and their allies in the army fired a Soviet-era ballistic missile at an army base in the central province of Maarib on Friday, killing at least 60 Gulf Arab soldiers on Friday.
The alliance has deployed 10,000 troops to Yemen, Qatari news channel Al Jazeera said.
Yemen’s neighbors ramped up airstrikes on Sanaa on Tuesday and hope to launch a decisive assault soon on the city.
“The number of coalition soldiers who have already entered Yemen has risen to 10,000,” Al Jazeera reported.
“A second contingent of Qatari soldiers will arrive today at Yemen after entering Al-Wadee border crossing (with Saudi Arabia) ... as coalition forces have added to their military equipment with 30 Apache helicopters, armored vehicles and rocket launchers,” he added.

Ok this is getting good.

I really need to get a handle on the Saudi/GCC order of battle here.  What units have deployed and how do they rate?  What units are in reserve?

Still this is turning into a more compelling fight than the cluster fuck that is the US' effort against ISIS.  We're basically seeing the fight that we've all anticipated between Iran and Saudi Arabia/GCC.

I doubted their (Saudi/GCC) ability to respond to setbacks/reinforce success before.  After the setback of having a bunch of troops killed in a ballistic missile attack it looks like they're doubling down.

I'm asking again.  Do they have enough slack to exploit a breakthrough/absorb a setback now or is this all they can spare?