Tough Terrans

It seems that in most Science Fiction stories the aliens are much tougher than we poor earthlings and we're forever being terrorized by them.

However, I remembered a couple of stories from many years ago where we were the tough ones.

One was "With Friends Like These" (Alan Dean Foster) which was about aliens coming to Earth to ask for our help (after previous generations had finally beaten back we expansionist earthlings to our home planet and surrounded it with a force field that could only be broken from the outside). Pretty lightweight but humorous. Available online but the free places seemed like they may not have the author's permission so I can mention iTunes as a possibility (or find an old second-hand copy of the book of short stories with the same title).

Another one was "Danger - Human" (Gordon Dickson...the first short story he had published I think) where aliens who are worried about earthlings (because they found out that every 'n' hundred thousand years humans would suddenly expand into the universe and wreak havoc) figure out how to stop the next wave of us taking over the galaxy. Or not. It's available at the following link: http://www.baenebooks.com/chapters/0743471741/0743471741___1.htm

Terrans rule!