His assault squad fell from the sky on burning jets, kicking daemons down and shooting them with their plasma and bolt pistols. A roar of promethium from a flamer blasted three bloodletters to ash.

‘Fall back! Fall back!’ Messinius commanded, his words beating time with his blows. ‘Assault Squad Antiocles to cover. Devastators maintain overhead fire.’

Squad Antiocles drove the enemy back. Tactical Space Marines were retreating from the parapet, dragging human soldiers with them. An Ultramarine walked backwards past him, firing his bolter one-handed, a wounded member of the Palatine Guard draped over his right shoulder.

‘Fall back! Fall back!’ Messinius roared. He grabbed a human by the arm and yanked him hard away from the monster trying to slay him, almost throwing him across the square. He pivoted and punched, slamming the man’s opponent in the face with a crackling bang that catapulted its broken corpse over the wall edge. ‘Fall back!’

Mortal soldiers broke and ran while Squad Antiocles held off the foe. Telling to begin with, in moments the assault squad’s momentum was broken, and again more bloodletters were leaping over the edge of the rampart. The Space Marines fired in retreat, covering each other in pairs as they crossed the square diagonally to the Penitent’s Arch. The mortals were getting the idea, running between the Adeptus Astartes and mostly staying out of their fire corridor. With the fight now concentrated around Squad Antiocles, the Devastators were more effective, blasting down the daemons before they could bring their weight of numbers to bear upon Antiocles. Sporadic bursts of fire from the retreating Tactical Marines added to the effect, and for a short period the number of daemons entering the square did not increase.

Messinius tarried a moment, rounding up more of the humans who were either too embattled or deaf to his orders to get out. He reached three still firing over the parapet’s edge and pulled them away. A daemon reared over the parapet and he crushed its skull, but a second leapt up and cleaved hard into his fist, and power fled the weapon. Messinius pumped three bolts into its neck, decapitating it. He moved back.

His power fist was ruined. The daemon’s cut had sliced right through the ceramite, breaking the power field generator and most of the weapon’s strength-boosting apparatus, making it a dead weight. He said a quick thanks to the machine’s departed spirit and smashed the top of his bolt pistol against the quick seal release, at the same time disengaging the power feeds by way of neural link. The clamps holding the power fist to his upper arm came loose and it slid to the floor with a clang, leaving his right arm clad in his standard ceramite gauntlet. A century together. A fine weapon. He had no time to mourn it.

‘Fall back!’ he shouted. ‘Fall back to the Penitent’s Arch!’