Quest problem "the guns of northwatch"

There is a problem with the following quest in the barrens.

“lvl 20 The Guns of Northwatch”

it requires you to kill

captain fairmount
cannoneer whessan
cannoneer smythe
and get 10 theramore medals

i fought all the way into cannoneer smythe and killed him several times with my mage to never get the quest state updated, upon finding this out i never checked if captain fairmount gave completion when killing him, and just moved on to a different quest