The 99th Infantry Division was formed in 1942 and deployed overseas in 1944. The "Checkerboard" or "Battle Babies" division landed at the French port of Le Havre and proceeded northeast to Belgium. During the heavy fighting in the Battle of the Bulge, the unit suffered many casualties, yet tenaciously held its defensive position. In March 1945, the 99th advanced into the Rhineland, crossing the Rhine River at Remagen on March 11. After fighting in the Ruhr area, the unit moved southward into Bavaria, where it was located at the end of the war.

On May 3-4, 1945, as the 99th moved deeper into Bavaria, it liberated one of a number of Dachau subcamps near the town of Mühldorf. The unit reported on May 4, that it had "liberated 3 labor camps and 1 concentration camp." The concentration camp was one of the "forest camps" (Waldlager) tied to the Mühldorf camp complex. The 99th Infantry's report stated that 1,500 Jews were "living under terrible conditions and approximately 600 required hospitalization due to starvation and disease."