Fetch and -t

I have found that if I add a remote and do a "git fetch -t -f remote_name" that it *only* pulls tags.

Reading the man page it seems like it should pull all the remotes and all the tags and the commits only reachable by tags.

Am I misreading this or it supposed to work this way.  I don't mind doing two fetches to get everything, but the documentation needs to be a little clearer.