The map Big Jumblies, formerly named fbnsensei, has a choke point in the middle that is hard to fight through.

The epic Battle of Fbnsensi on this map lasted for about 180 rounds, involving

Hanarthuran (purple)

skrumgaer (yellow)

and

Lardhat (red)

Skrum had lands in the north and in the south where Lardhat was, but followed the call in the south and abandoned his northern lands and he and Lardhat took turns fighting Hanarthuran through the isthmus...but Hanarthuran eventually prevailed. The battle is described in a poem by skrumgaer that begins:

Among the moors of ffbsensi, many turns ago,
shone the comet in the south and above the snow
the vulture soared, and in between the land
could hear the skirling pipes of Arthur'c clan...
in the battle of ffbsensei......