GRUNWALD, POLAND—Archaeologists and metal detectorists joined forces to look for traces of the Battle of Grunwald, fought on July 15, 1410, according to a report in Science & Scholarship in Poland. On that day, the Kingdom of Poland and the Grand Duchy of Lithuania defeated the German-Prussian Teutonic Knights in what is remembered as one of the largest battles in medieval Europe. Szymon Drej of the Battle of Grunwald Museum said the team recovered about 300 artifacts, including arrowheads, Prussian spearheads, and a seal bearing a Christian image of a pelican feeding blood to chicks in a nest. The seal, thought to be connected to a chapel that later stood on the battlefield, resembles one found in the courtyard of Malbork, a castle built by the Teutonic Knights in what is now northern Poland. After the battle, Polish and Lithuanian forces laid siege to the Malbork Castle in an attempt to crush Prussia. But the castle withstood the siege and the Teutonic Knights lost little territory in the Peace of Thorn of 1411. The researchers will continue to search the area for evidence of the battle. For more, go to “Off the Grid: Krakow, Poland.”