What did Abraham do after the people of Sodom were taken captive?

Abraham assembled a small army from his own servants and recaptured the people of Sodom who had been taken captive. He then returned after the victory, and Melchizedek, the High Priest of Salem, brought forth bread and wine of all things.

The context explains that Abraham had put together a little army out of his servants and recaptured the people of Sodom who had been taken captive, and he was coming back after their victory. At that point Melchizedek, the King of Salem and High Priest, brought forth bread and wine. This was not what they normally used in the sacrifices of Abraham's day, but was a subtle prophecy of the resurrection, which is the whole idea of the Lord's Supper—a constant reminder, as Jesus administered it in Matthew 26 and as tied together in I Corinthians 11.

Genesis 14

Who was Melchizedek and what was Salem?

Melchizedek was the High Priest and King of Salem, a position not belonging to the Jews, who had not yet been formed. Salem was the little village that later became Jerusalem. He brought forth bread and wine, a subtle prophecy pointing to the resurrection and the Lord’s Supper.