Returning to military service, Mikołaj Abramowicz served in the 1633–34 Smolensk War and, holding the rank of colonel, was one of the negotiators in the June 1634 Treaty of Polyanovka, which ended the conflict. In 1638 King Władysław IV Vasa nominated him as Cześnik Wielki Litewski (Great Grand Duke's Cup-Bearer of Lithuania). He rose to the office of castellan of Mścisław in 1639, General (top commander) of the Artillery of Lithuania in 1640, Voivode of Mścisław in 1643, and voivode of Trakai in 1647.