Rex stands at the back of a gunship with General Skywalker, Commander Tano and a few toopers from the Five-Hundred and First. He grabs the bar above him for balance as the ship flies over the high trees of Locuna's forests. Rex doesn't know how long they've been flying exactly, but judging by the pain in his legs from standing, he'd say a couple hours.
They arrived on Locuna after the Chancellor received a call for help from the plane't government. Apparently the Separatists have been harassing them to join for months, it was only a matter of time before they finally launched an invasion. Its not surprising they were attached. Locuna is a planet rich with valuable resources and is placed next to a vital hyperspace lain. It's important the Separatists don't take this planet. If they do they could easily run supplies almost anywhere in the Outer Rim.
The only armies close enough to intervene were Skywalker with his 501st and Kenobi with his 212 attack battalion. They both managed to take down the weak blockade and land near the City of Stone, Locuna's Capital, and now their base of operations.
Now the General, the Commander, Rex and a large chunk of his men are on their way to join General Kenobi's men on the front line in four gunships and a LAAT/c carrying an AT-TE.
"Sir, there's a transmission from General Kenobi," their co-pilot says over the ships speakers.
Rex looks over at their own General. They're supposed to have radio silence, so why would Kenobi contact them? Rex know's in his jut that something bad has happened. Skywalker's expression tells Rex he's thinking the same thing.
"Put it through" Skywalker orders.
A life sized version of Kenobi appears before them in holographic form. He doesn't look happy.
"There's been a change of plans. I need you and your men to go to the city of the forest, evacuate the citizens, and bring them to the Capital," Kenobi says, folding his arms.
"What happened?" Skywalker asks, voicing everyone's thoughts after a moment of processing. They're all is caught off guard by Kenobi's orders. Rex and his men are prepped for a battle, not an escort mission.
"the Cities are being attacked by bomber droids. The City of Forest is the closest one to your position, and the most damaged."
"Can't you send Fighters to shoot the droids down," the Commander asks, as if she can read the Captain's mind too.
Kenobi strokes his beard as he goes on, "All the Fighters were destroyed getting through the blockade, and we wont be receiving more for at lease a week. You now have the city's coordinates, and I'm also sending a gunship with enough rations for the journey back. Your remaining men are heading to the other cities that were hit, and my own will keep the enemy busy until you finish. Just worry about getting the people to safety. And Anakin, do be careful."
Skywalker smirks at that "Of course master, when am I ever not careful?"
"Oh the memories" Kenobi mutters, touching his forehead before the hologram shuts off.
"Should I send the Carrier back?" Tano asks her Master shortly after.
"We might need the Tank." The Caption advises. Skywalker considers it and nods in agreement.
"We'll be close to the front lines, so bringing it along won't hurt" he finally decides. "Rex-"
"Already on it" Rex replies, activating his bucket's comlink to tell the men about their new mission.
"I sense this isn't going to be easy" Skywalker mumbles to no one in particular, after a long time of silence.
"I just hope it's a small city" Tano replies. Rex turns his comlink off when he's done. He watches the giant trees through the cracks in the blast doors as he feels the gunship change its course. Away from a battlefield, and towards a broken city.