Can you summarize the main points about the first edition of the Dota 2 tournament, The International?

The first edition of The International was held at Gamescom in Cologne, Germany August 17-21 2011. Sixteen teams were directly invited by Valve to complete for $1 Million grand prize. The tournament was played in a round robin group stage, followed by a double elimination playoff. The Ukrainian based team, Natus Vincere defeated the Chinese based EHOME 3-1 in the grand finals.