When humanity first ventured out among the stars, it seemed that we were alone in the universe, the only tool-users in the galaxy - and thus were free to mold the very cosmos to our heart's desire. It would take us a long time - our star drive wasn't very fast - but it was our Manifest Destiny ..and besides, there was no one to stop us - Then we met the Tampies!
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Used availability for Timothy Zahn's Warhorse
March 1990 : USA Mass Market Paperback
October 2012 : USA, Canada, UK Kindle edition