When the decrypted Ansom marches on Warchalking after TBfGK, it is a small level 2 city held by Unaroyal and described as being valuable primarily for its farms. It also possesses an orchard and a mill. Its defenses consist of its location on a small hill, an earthen berm capped with stones for an outer wall featuring an iron gate between stone blockhouses, and an inner garrison fortress of logs around a stone tower with a wooden roof.
The side that won the battle vs. Lord Manpower and conquered Warchalking might have been Unaroyal, because they held that city when it was reconquered by Gobwin Knob. Unaroyal Spearman Wrigley indicates that the Marbits "did most of the work at Warchalking", further indication that Unaroyal lead the origional attack.Erf-b1.5-p034
Distance from Gobwin Knob
Warchalking is at most 54 hexes away from Gobwin Knob, if each of those hexes costs at most 1 movement point to travel through. This has been determined from the following evidence:
Wanda is able to reach Warchalking on the back of a Green Dwagon and uncroak Lord Manpower the Temporary's corpse before it dissapears at dawn. Erf-b1-p084 Green dragons have a minimum movement of 56+.Erf-b1-p047
The Decrypted army lead by Wanda and Ansom reaches Warchalking on turn 4 after TBfGK. It is implied that they left Gobwin Knob on turn 2. With a movement of 18, the stack could travel trough 54 hexes that do not incur a movement penalty in the three turns it took to reach Warchalking.
Real World Reference
Warchalking is the drawing of symbols in public places to advertise an open Wi-Fi wireless network.