OK, so if no dwagons can round trip from their current location then no dwagon can round trip there from GK, so if Stanley sends Parson out to the new front line over the lake with a spare dwagon, that dwagon (and possibly Wanda!) are now part of the battle, and if GK doesn't have another spare... Ouch. That makes this a real all-or-nothing battle for GK.
Now...
Or, since everything is on a knife's edge and we're in the latter half of part 1, this arc could end in a wild battle for everything, with each side trying to hold its fracturing command while in a situation where a single tactical error could cost them the whole conflict. All of the personalities would be vividly engaged with each other in a fight that could go all the way down to a nail-biting, last-second, skin-of-the-teeth victory which would be a great way to end the siege. (Notice that I didn't say for whom the victory would be; I figure that it'll go for GK simply because of the fact of Parson, but it ain't necessarily so.)
To look at it in purely mechanical terms, how do you surgically get through 19 dwagons to strike at a few warlords who, more than likely, are taking direct orders from a tactical genius? (That's assuming that Stanley doesn't lose his boop and take over command, in which case it'll still be ugly, but Ansom should be able to pull it off.) The dwagons and their warlords should be able to muster a formidable defense, and Jillian might just lose the plot, again, and start whacking at any dwagon that gets too close to her or to Ansom (and, say, get captured again, distracting Ansom from his mission to kill the dwagon that captured her--or vice versa). Even if Jillian behaves, and unless the Archons have some powerful mojo they can lend Ansom (invisibility? teleportation within a hex?), even a surgical strike will be incredibly costly. It's broad daylight, nobody has any cover of any kind, and everyone can be attacked from all sides. It's nightmare scenario #1 for any sort of tactical strike force and unfortunately that's what both sides are.