I don't own Warhammer so please don't sue me.
Hour five-Surface of Valnes III defense facility (5 hundred hours, Sol Time)
Mclane ran down the stairs quickly and looked at the computer screen leaning over the young operator's shoulder.
"What are those corporal?" Mclane asked pointing at an icon on the screen moving at about 300kph 500 kilometers away from the facility they were holding. The corporal touched the icon on the screen (a red viper).
"Sir, that's a detachments of the Shrieking Hawks space marine legion. What you're looking at is one of their Thunderhawk gun ships flying patrol." The corporal said.
"Hail them." Mclane Said.
"Very well sir." The corporal replied. The corporal pressed a button and then pushed the icon on the screen.
"Done sir." A face came on screen one of a space marine in black armor with short hair, blue eyes, and a square face.
"I send my regards Captain Mclane, how my I assist you, sir?" The marine pilot said calmly and very politely.
"As you may be able to see from your altitude we are pinned down inside defense facility coordinates 500.912 by 3122.664 by a massive tyranid assault can you assist us?" Mclane asked hurriedly.
"How is air space above your position?"
"Good, but ground fire is very heavy, we can give you updates if needed."
"Very well I have 10 space marines ready to fight, and we also have about 18 tons of weapons and ammunition. I'll let you talk to Sgt. Velen in charge of the squad." The pilot disappeared and after about 30 seconds a tall marine with brown eyes, and dark hair.
"How are you holding up down there?" Velen asked.
"Fairly good we've lost only about 4 imperial guardsm-"Mclane was but off mid word when a huge explosion shook the bunker slightly. He saw that a shot from a venom cannon had exploded right in the midst of squad delta and only 2 members remained alive. Even worse a huge hole had been blown in the wall leaving the right flank very vulnerable.
"Never mind that we've lost 12 guardsmen and the right section of the wall is blown in two. We need back up ASAP." Mclane yelled.
"Very well, sir." Velen said.
"Also if you try to land you'll be shot down I recommend that you guys parachute out from about 3000 feet. Also we need those supplies you have would you drop some of that for us to use."
"Your wish is my command, sir. Our ETA to you is 1 hour at top speed." The screen went blank. Mclane ran back up to the top to see that Storm Trooper squad "Zeta" was already down there setting up sand bags and firing of shots making sure that nothing got through. He wiped his brow but he inside knew that they couldn't hold out for much long without support. He estimated if they were to continue at this rate in 17 hours everyone there would be dead and the facility overrun. But his troops were fighting hard, and he hoped he was wrong.