In 1386 Duke Leopold the Hansome of Austria and his allies went to war with the Swiss in Lucerne, Sempach, and Richensee. With 4,000 cavalry and 1,400 foot soldiers they moved against 1,300 Swiss peasants at Sempach. The Swiss were outnumbered and without armor but Arnold von Winkelried of Unterwalden led them in a final deparate attack. They prevailed, killing 2,000 Austrians on July 9, 1386.
     The stamp was issued in 1986 to mark the 6th centenary of the Battle of Sempach. The catalog indicates that the map dates from 1698.