This is long, and assumes coming through the doorway will slow the spiders enough that the group gets one "free" round of missiles. Rolls weren't helpful.
Ji-ho Captain [2d6+1]=6+1=7
Darfilla Alchemy [2d6+1]=4+1=5
Number the doors in room #2, with Door Number 1 is the eastern door to Room #3, where the spiders. Door #2 leads into Room #1, mostly empty. Door #3 will be the main battle area, and Door #4 also goes to the exit(s).
Assume map is oriented with North as "up".
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Door #1
RIGHT NOW Ji-ho and the stronger dwarves are pressing against the door to slow down the spiders advance.
WHILE the 6 Light Inf bring in as much brush to burn as possible
SO THAT those on the Door #1 can retreat to in front of Door #3 when the brush is ready.
Door #2 Will be left open, so spiders my go in there and be lost or delayed.
Door #3
RIGHT NOW Drotik and Si-Woo are just outside of the door (on the left most of 2 grid lines on the map) and have missile weapons ready.
SO THAT they can fire through the door at any large spiders
ASSUMING Ji-ho and the dwarves get out of the line of fire.
HODLAR is 10' from Door #3, with torches in case the Alchemy does not work. He will toss the torches and exit via Door #3, and be in the rear of the corridor.
Morwen is north of Hodlar, and will direct her magics against the large spiders and then head down the corridor.
Door #4
Darfilla is just north of Door #4, with her alchemical wonder.
SO THAT as soon as the spiders bust through,
AND IF Ji-ho and the dwarves are out of the way, she will launch her thing
AND THEN she will run like crazy through door #3 and keep on going until she is outside and well behind the defensive line.
RIGHT NOW Gar and the 3 SK are piling as much burnable stuff behind (corrider side) of Door #4 to deny the spiders use of that corridor.
SO THAT Gar will remain behind and light the brush if the spiders come through, or if the party is being pushed back (north)
Outside
RIGHT NOW Morphin is setting up the defensive spear wall (3 HI, 2HXb), mixed with crossbow shooting from the second rank, and about ten feet from the entrance.
Darfilla will get behind the line as fast as she can.
The LI and Sk will guard the flanks as best they can.
PRE BATTLE
Gurav, Korev, and Ji-ho, currently at Door #1, retreat to door #3, behind Drotik and Si-Woo. Ji-ho arms with bow.
SPIDERS THROUGH THE DOOR
Si-woo, Drotik, and Ji-ho fire AT THE LARGE SPIDERS
Darfilla will light the brush and flee down the corridor and OUTSIDE.
Drotik exits out the corridor and takes command of the HXb OUTSIDE
Si-Woo stays on the bow, and retreats partway into the corridor.
CORRIDOR BATTLE
Four melee lines, in case someone falls or the spiders try to use the walls to flank us.
- Ji-ho and Gurav form the first melee line.
- Rolton and Bofur form the second melee line.
- Verdugo and Korev form the third melee line.
- Hemia and Borav form the third melee line.
CORRIDER REAR GROUP
Si-woo
Morwen and her crew
Hodlar
- Gar is in the other corridor but will join this group once he lights the brush.