The Heiligenbeil Pocket or Heiligenbeil Cauldron was the site of a major encirclement battle on the Eastern Front during the closing weeks of World War II, in which the Wehrmacht's 4th Army was almost entirely destroyed during the Soviet Braunsberg Offensive Operation. The pocket was located near Heiligenbeil in East Prussia in eastern Germany, and the battle, part of a broader Soviet offensive into the region of East Prussia, lasted from 26 January until 29 March 1945.