The Duel at New Avengers Facility was a confrontation between Ant-Man and Falcon.
Preparing to steal the Yellowjacket Suit from Darren Cross, Hank Pym, Hope van Dyne, and Scott Lang planned to visit one of the warehouses owned by Howard Stark to steal the Signal Decoy.
Upon arriving, they discovered that after the Battle of Sokovia, the warehouse was rebuilt, and became the New Avengers Facility.
Sam Wilson was one of the members recruited by Captain America to the Avengers. The New Avengers Facility is the Avengers' training facility.