The Tyranid boarding spore had done little harm to the outer hull of the Kass'l class gunship S'nail, but its deadly cargo of Genestealers had already vanished in the ships labyrinthine airducts and hallways by the time the crew reached the breach site.

On the Kass'l S'nail

The path to the ships drive core controls was long and twisted, and automatic defense drones (under the command of a suited shas'ui) were patrolling it throghout its length.

The Genestealers, once they were close to their objectives, relied on their usual tactics: Inhuman speed and local numerical superiority to overwhelm their enemies before they even became aware of their presence.  The first drone squad was attacked and annihilated before it knew wht hit it, and the second squad (including the shas'ui) was close enough to be inveigled in a close combat before they managed to fire themselves.  They did manage to sound the alarm, though, a feat not matched by the first three, and the shas'ui fought heroically,surviving a round of combat.

The third and fourth brute squads became aware at enough range to actually get off a few shots, but their fire was erratic and they only succeeded in felling one of the 'Stealers each.

The bulkhead doors, fog dispensers, and other obstacles placed in the way of the onrushing horde proved to be of little utility.  The nimble Genestealers clambered over everything, including each other, in their mad rush towards the objective.

The 'Stealers stumbled in a long straight passage near their target, and the defenders managed to get a few shots off, but their shooting was terrible and not a single shot hit.

In the control core, two drone squads were all that stood between the eight Genestealers and victory.  There was a flurry of claws, some clanging of metal striking metal as drones and parts of drones struck the hullmetal, and then it was all over.

The Drive control in ruins, the Kass'l S'nail drifted helplessly, as a cloud of mycetic spores drifted past it, directly towards the once so rich and peaceful fields of New Oklahoma. Such hopes they had had, for this world - now ruined by the degenerate Gue'la, and even the ashes set to be consumed by the horrible alien Tyranid.  The Tau air caste commander could only watch and hope that the last of the evacuation vessels had cleared the atmosphere before the monstrous planetfall.

Thought for the Day: Hatred is the shield of the Faithful


Combat results: Kill-Team: Sabotage. Tyranid wins

KillTeam

Brutes

Tactical analysis

The long, winding corridor terrain practically guarantees that the mission is resolved as a series of short, close-quarter battles.  The Kill-Team attacker generally likes the dispatch the enemy piecemeal where the Kill-team quality can trump the Brute quantity, and Genestealers of course likes the close-quarters part.  So, with the terrain set the way it was, I doubt the game could have ended any other way (bar hostile dice, of course, and they were fairly neutral throughout the game).