The Story of a Hero

I wrote this a while back as a start to a series. I didn't complete it, but I have now. Anyways, here it is:

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The sounds of mortars exploded in Cassius's ears. His battle-brothers ducked as a mortar-shell exploded almost next to them. Cassius was thrown back by the exploding mud and the shards of shrapnel spreading in every direction it was possible to spread.
He looked around. His battle-brothers layed in the Trench, or what was left of the Trench, mangled. The sergeant grabbed Cassius and pulled him in to cover as another shell exploded close to them.
"I thought I was a goner," Cassius said to the sergeant.
"You almost were, brother," he replied, as he reloaded his plasma pistol. "Now load your Plasma-gun, we're gonna need it!"
Cassius nodded as he loaded his plasma-gun with a new cartridge. The sergeant looked up from the wall of sandbags and rocks. He stared ahead, almost terrified. "Down!" he shouted, drawing his thunder hammer.
Cassius hit the floor as soon as he heard the single word. A hammerhead passed over them, slowly. When the Hammerhead passed over them, the Sergeant looked up from his cover.
Five Plasma shots flew past the Sergeant's head as two Crisis Battlesuits approached. The sergeant grabbed Cassius by the arm and started running, thunder hammer in his hand.
Cassius pulled off a plasma shot taking the first Battlesuit's leg out. The Battlesuit hit the floor and exploded. Shrapnel followed him.
The sergeant got a piece of shrapnel in his throat. He collapsed to the floor close to the other side of the trench, dropping his Thunder hammer. Cassius dived down on to the floor, not noticing the sergeant. "Keep running!" Cassius shouted.
But the sergeant couldn't get up. Cassius looked at him. The sergeant looked back. Cassius saw the piece of shrapnel embedded in the sergeant's throat.
"Go on," he said to Cassius, tears running from his eyes.
"I can't leave you brother," Cassius said, knowing what was happening.
The sergeant picked up his thunder hammer with the rest of the strength he had in him. "Take it, brother," he said.
"Sergeant-"
"-Take it!" the sergeant thrust the hammer in to Cassius's hand. Cassius took the hammer and nodded. "Use it well."
The sergeant smiled at Cassius. Cassius smiled back. The sergeant's grip on the hammer loosened as he closed his eyes.
Cassius stood up and ran towards the hammerhead and fired his plasma-gun with his right hand until it snapped empty. He dropped it on the floor and, as soon as he caught up with the Hammerhead and a few incoming broadside battlesuits, smashed the hammer on the floor.
One of the broadsides leaped from the floor and landed on its feet again. The other broadside fired its rail guns at Cassius. Cassius, managing to outrun the incoming rail shots, drew his bolt pistol and fired at the hammerhead.
Two men fell off the hammerhead gun mount and fell to the ground. The hammerhead spun round and pulled off a few rail shots at Cassius. Cassius ducked and threw a krak grenade in to the air. With a well-calculated moment of luckiness, Cassius hit the krak grenade towards the hammerhead.
The krak grenade landed in the turbines and exploded.
The hammerhead launched itself to the side and in to the ground. Then it exploded, shredding metal everywhere.
Two more tactical squads ran towards Cassius. Severus, captain of the second company, ran towards Cassius with them. "How the hell did you manage that one?" he asked, amazed.
"With a well-placed krak grenade captain," he said as he took off his helmet.
"Isn't that your sergeant's hammer, Cassius?" one of the marines asked.
"Yeah but he's dead," he said. "He gave this to me. I expect he was meaning for me to finish off that-"
"Down!" Severus shouted as the earth rose above them.
Cassius dropped his helmet and dived towards Severus. Severus ran towards the hammerhead ruin with Cassius. The broadsides were running towards them.
Cassius grabbed the first broadside and hit it with his thunder hammer. The broadside collapsed to the floor on his front.
Severus grabbed a part of the other broadside's leg with his power fist and started to climb.
The remaining battle brothers fired their bolters at the collapsed broadside. The broadside got up, but it's rail guns were broken almost in half.
Cassius smashed the hammer against the broadside's head, making it fly off. As the broadside tilted forward, Cassius jumped off towards the Marines.
Severus pulled the other broadside's head off with the strength provided by his power fist. He jumped on to one of the rail guns, in which was firing at the marines, and tore off a wire. He jumped off.
The Broadside's final Rail shot ended up in an explosion.
Luck came in large packages

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What do you think?