Hamfurter is a city around the cities of Goodminton and Haffaton, referred to as 'outpost'.
It was captured by forces of Goodminton from Haffaton - together with another outpost, Frankburg - with help from Wanda's uncroaked.IPTSF Text 7
It may have belonged to Haffaton originally.
Outpost probably refers to a Level 1 city. What is described as "stockade's wall of sharpened logs" is likely the city wall.IPTSF Text 11
Real World References
Names of Frankburg and Hamfurter recombine the names of cities in Germany - Frankfurt and Hamburg with a possible reference to hamburger and frankfurter.