Alright. Time for distraction techniques.
Pull the supplies out of the supply scout salamander, and the ministorum priests with their men out of theirs(if they'd be willing. The three will form a wedge pattern and drive at full speed towards the gate, their armor should help them survive the bolter fire, and act like they're going to ram it. Meanwhile, flamer squad will use their scout salamander at top speed, but indirectly, and try to get around, to one side and next to one of the turrets, disembarking and charging in to clear out the area. Ralph's squad will also disembark, and the heavy weapons squad will go in their Salamander, soon after the Flamers have gone, so they aren't bunched up. They will use the oppurtunity the flamers and the salamanders distraction gives them to set up their weapons and begin raining hell on the enemy turret(s), prioritizing the one by them if the flamers haven't managed to disable it. On the other side, whilst the flamers move in, the anti-tank squad will do the same thing, preferably simultaneously, setting up to destroy the turret by them. In all cases, once squads have disembarked, the salamanders are to protect them as best they can from anti-infantry fire. Two squads of scouts are to sneak or set up outside of the Tarantula's range, and suppress enemy anti-vehicle weaponry with sniper fire. We would ask the ministorum priests to accompany the flamer squad and heavy weapon squad, while Ralph leads the remaining two scout squads in a speed play once all necessary 'distractions' have been set up, making their way to advantageous positions and taking oppurtunity attacks when they can, relocating when necessary. They will prioritize enemy commanders and melee specialists. Finally, the Veteran Infantry should accompany us in the command chimera, whilst the two infantry squads move to support both turret killing operations, one each, on foot, once the enemy s sufficiently distracted. Our chimera, finally, will make it's way to the gate. The initial wedge of salamanders will not, in fact, ram the gate, turning away at the last reasonable time, one turning as if it were going to ram the tarantula the flamers are attacking, two as if they were to do the same to the tarantula the anti-tank squad is taking care of.
Of course, I could be making assumptions. >.>