I think that one was in the GH Wars....I was going to mention Ossian's Raid (wee, I just did), but I forgot where it was originally mentioned so I can't give any detail.
Oh there are a lot a battles mentioned throughout the various Greyhawk sources, including the Dragon articles you mentioned, but AFAIK most of these were never given a name. Lacking a name, these seem to be less useful for "major" battles, depending on what the OP's use for them is (I assumed they needed something for a story or adventure hook).EGGs updates to the WoG in Dragon Magazine had a few more battles... Iuz vs. damn near everyone he borders (I recall attacks into the Wolf Nomad land and the Vesve Forest), Horned Society vs. Rovers of the Barrens, another battle near Ratik (Bone March humanoids vs. Ratik with Frost Barbarian allies), others...