Robert Douglas, Count of Skenninge, Baron of Skalby, was a Scottish cavalry general during the Thirty Years' War rising to the rank of Field Marshal (1657–1662) in the Swedish-Polish wars that followed. He founded the Swedish branch of Clan Douglas.

The Battle of Jankau, also known as Jankov, Jankow, or Jankowitz, took place in central Bohemia on 6 March 1645, near modern Czech town of Jankov. One of the last major battles of the 1618 to 1648 Thirty Years' War, it was fought between Swedish and Imperial armies, each containing around 16,000 men. The more mobile and better led Swedes under Lennart Torstensson effectively destroyed their opponents, commanded by Melchior von Hatzfeldt. However, the devastation caused by decades of conflict meant armies now spent much of their time obtaining supplies, and the Swedes were unable to take advantage.