What did Paul and his companions do after spending time in eastern Galatia?

Les teaches that after Paul and his companions spent time at the eastern end of Galatia, they retraced their steps and returned to Antioch. This took place at the close of the first missionary journey, which had taken Paul through Attica, Pisidia, Lystra, and Derbe. Les notes these were little cities not far apart, and that Paul performed a miracle in Lystra and was stoned in Derbe. The context then moves to Paul's second missionary journey, to be covered later, and to his letter to the Galatians, written urgently because the Judaizers were pressuring the Galatian assemblies to come back under the Law.