In the 1939-1940 Egypt excavation season, he discovered the completely intact tombs of 3 kings: Psusennes I, Amenemope, and Shoshenq II along with the partially plundered tomb of Takelot I in Lower Egypt at Tanis. The latter tomb contained a gold bracelet of Osorkon I, Takelot's father, as well as a heart scarab. He also found the fully plundered tomb of Osorkon II as well as the partly plundered tomb of this king's son, Prince Hornakht. The start of World War II in Western Europe in May 1940 stopped all excavation work at Tanis. However, after the war, Montet resumed his activities at Tanis and proceeded to uncover the intact tomb of General Wendjebaendjed, who served under Psusennes I.