A truce was briefly called when Rogers and Stark both discovered the bombing was actually caused by Helmut Zemo, a Sokovian who lost his family during the Avengers battle against Ultron. However, the situation escalated again when Stark, as part of Zemo’s insidious plan to destroy the Avengers, learned that it was Barnes who had killed his parents years before and that Rogers had kept the information from him. In a bitter fight between Iron Man and Captain America, Rogers managed to eventually subdue Stark and walked away from the Avengers completely, leaving his shield behind. However, he sent Tony a message soon after, explaining his regrets over what had happened and letting Tony know he would be there for him should the need arise, leaving Stark a phone he could use to contact him if need be.
After breaking out the heroes who’d fought alongside him against Stark’s crew—and been imprisoned as a result—Steve Rogers accompanied Bucky Barnes to the technologically advanced nation of Wakanda to seek the aid of T’Challa, who also had learned of Barnes’ innocence in his father’s death. The Black Panther agreed to help his former foes, assuring Captain America it would be far from easy for any who may learn of Barnes’ presence in Wakanda and attempt to strike at him there.
For the next two years, Rogers remained on the run, staying in close contact with fellow fugitives Romanoff, Wilson, and Maximoff. Rogers eventually came out of hiding when Bruce Banner used the phone he’d left Stark to make contact, informing Rogers of the impending threat of Thanos, who was hunting for Vision’s mind stone. In Scotland, Rogers, Romanoff, and Wilson arrived in time to help fend off an attack against Maximoff and Vision by Thanos’ agents.