Awesome chapter! Their fight was fun to read, Suzuki doesn't wast any panels. Mel and Ban seem to be pretty much equal, with the former being the stronger of the two, while Ban is the faster. Although, the balance might shift once their manage to put their hands on their legendary weapons again.
It's was good to see another flashback, this time of the two's first meeting. I like these short flashbacks. So that's what we know so far about the timeline:
So, in the distant past there was a ancient war between the Maiden Clan and the Demon Clan, which resulted in the defeat of the latter clan.
Seven hundred years ago King leaves his country for unknown reasons, with his sister Elaine remaining as the sole guardian. (ch. 25.5)
The Seven Sins were most likely formed between twenty to ten years ago, as Ban wasn't yet a member. So twenty years ago the Fairy King's forest is attacked by the Demon, Elaine dies and Ban becomes immortal. A short time later, he's arrested for "his" crimes. (ch. 25.5) The Demon is found by Hendricksen.
Sixteen years ago, Meliodas busts Ban out of prison. He asks Ban to join him (ch. 34)
Meliodas and Diane meet for the first time. (ch. 8)
Ban goes through his phase of collecting stuffed animals, angering King. (ch. 18)
Ban tries to grab Meliodas' sword, causing the latter to leave a permanent scar on his neck. (ch. 9)
Ten years ago, the Great Holy Knight is murdered and the Sins are accused of trying to stage a coup d'état; they scatter around and disappear. (ch. 5)
Five years ago, Ban willingly lets himself get captured by the Weird Fangs. (ch. 14)
Hauser was fun this chapter, too. I bet people of his generation had grown up hearing stories about these legendary men.