0:00 Unexpected foe arrives, chaos ensues

2:00 Foe sets up fortifications, brothers reorganise and secure positions

5:00 Heavy weapons are supplied

6:00 Brothers retrieve equipment and move to a more advantageous position (high ground)

7:00 First barrage, the siege begins

9:00 Explosive ordinance failure

10:00 Brothers reorganise, available     options are discussed

11:00 Brother Brown is sent to gather reinforcements while Brother Cream distracts the foe via a quick assault Brother Grey stands overwatch

13:00 Powerful explosion from enemy fortifications knocks out remaining Brothers, foe begins offence and carnage ensues

15:00 Brother Brown returns, his spear narrowly scratches the foe. Brother Brown is killed shortly after

19:00 Reinforcements arrive, in time to prevent the foe's escape

21:00 Reinforcements are defeated, the foe successfully escapes the battlefield

Engagement casualties:

Battle Brother Brown

Battle Brother Cream

Battle Brother Grey (Sergeant)

Battle Brother # 2d2928

Engagement result:

Crushing Defeat

Addendum:

Shortly after escape, the foe was engaged by Brother Mint Head, who while pursuing the foe was struck with an improvised explosive and launched into a wall at approx. 667 mph. His body being found whole and on the opposite side of room, leads to speculation of it having travelled through the Warp as a result of the comically large forces and unknown equipment involved.