The Battle of Sokovia was a major battle between the Avengers and Ultron in Novi Grad, Sokovia. Convinced that humanity was the greatest threat to peace on Earth, Ultron planned to commit global genocide by creating a device that would lift the city of Novi Grad skyward and cause it to recreate a meteoric impact when it crashed into the Earth. The Avengers' actions, however, resulted in the threat being neutralized and the Ultron Offensive being brought to an end. - https://marvelcinematicuniverse.fand...tle_of_Sokovia
This is all that remained.