So it finally happened, 12 hardy souls got together to re-fight the siege of terra, as it was looking to be a vast game, we split into 3 groups of 4, each playing a different part of the conflict, for my part, I was tasked with defending the imperial palace gates with my imperial fists alongside Tiny-Tim and his blood angels, arrayed against us were Apocolocyntosis's World Eaters and Consul Avenging Angel's iron warriors and death guard
The Chaos players set up right outside the outer walls, ready to swarm in, we garrisoned the guard infantry in the trenches and bunkers, supported by titans and marine tanks, with most of the marine infantry being used as a last line of defence on the palace itself, sigismund boarded a thunderhawk, waiting for an opportune moment to strike down a powerful foe, while Dorn sheltered in the palace walls, Sanguinius sat deep inside the palace waiting to teleport into the fray. Angron sat on board his orbiting space craft, while perturabo and mortarion mucked in with the troops and decided to footslog their way in.

Titans breach the walls and the battle for the palace begins! the marine preds zap some defilers, breaking them, defilers 'withdraw' straight towards the imperial lines....

with laser guided precision, the Ordinatus shells the Shadowswords, breaking both of them, they withdraw and subsequently refuse to rally for the entire game... also coming under fire is the power-fist reaver who loses his shields to a volley from the plaguelord, after several more hits strike home from the banelord, he breaks and withdraws with 5DC remaining...

chaos stream through the gate and wall breaches and set to work clearing the first trench line, the nurgle troops massacre the plucky guard with heaps of disrupt and ignore cover weaponry, the surviving guard hide in the bunkers....

Manticores pound the cannon of khorne, breaking them with hit rolls of 4 6's, they save all but are broken, same story with the other formation, who lose two and break as well

Tim points and laughs as the banelord takes a warlord titan volcano cannon to the face.... shame it only does 1 damage and no crit....

defilers break and scuttle forward to threaten the preds and vindicators, hoping to rally and use their massive engage move to good effect in subsequent turns

plaguehound titans awaiting the moment to pounce
Turn 2

chaos begin to clear the second trenchline, berzerkers pod in with their dreadnoughts, but have a rough time with the guard and their solid cover saves, the guard manage to win the combat and survive unbroken

chaos forces continue to pour into the palace grounds, many of them marching and staying inside their vehicles for the increased engage move it offers

The loyal warlord destroys the reaver with a brutal sustain fire, the smoking wreck of the reaver remains, covering the advance of the world eaters, the gatling blaster knocked out the shields, then the reaver took 3 damage from the turbolasers before the volcano cannon blasted 3 more DC off it, it didn't explode and just stood there smoking slightly and swaying in the breeze
Turn 3

Chaos clear the second trench line, earning a nifty 5VP in the process, imperials fall back and consolidate to a defensive line, stripey reaver is now badly damaged after bravely charging a world eater company and stamping on them, reduced to a single DC, he awaits the inevitable shots coming his way

Sanguinius and the last line of defence brace themselves.... either they're going to be fighting for their lives, or sallying out to push the attackers back....

The blood angels sieze the opportunity to pounce and land a thunderhawk and terminators in the middle of the chaos advance, they slaughter everyone in reach and win the combat, clearing some space for the imperials

Angron and his elite bodyguard teleport in to engage the warlord....

....who stomps backwards out of reach and blasts the terminators, felling two and leaving them close to breaking.... a lone pred activates and finishes the job

The iron warriors terminators teleport in and blow up the crippled twin turbolaser reaver, however the titan goes down swinging (or stamping) and they are reduced to 2 broken stands

as the chaos air force fails to go on CAP, Dorn siezes his opportunity and lands his thunderhawk to engage Angron, the two primarchs face off, Dorn lunges at Angron and wounds him, but the behemoth fails to notice and promptly hacks dorn down.... the terminators in the formation wipe each other out, except the chaplain who flees, the marines win, but Angron is not fazed!
I didn't get any more pics, although sigismund flew out in a thawk and blew up a pair of warhounds, then spent the rest of the game being shot at by Iron Warriors havocs in trenches
A close day all round, but at the end, the imperium managed to edge the win, thanks in part to them destroying 15 titans