In summer 1944, Weiss managed to escape to
Switzerland, and studied at the
University of Geneva. In 1945, he boarded an
Aliyah Bet ship headed for Palestine. It was intercepted by the
Royal Navy, and Weiss was interned at
Atlit detainee camp. On 9 October 1945 the
Palmach raided the camp and freed 208 inmates, Weiss among them. One of his rescuers was
Avshalom Haviv, who would eventually be hanged alongside him. Weiss moved to
Netanya, where he worked as a menial laborer and jewelry retoucher. He joined the Irgun, which was then conducting
an insurrection against the British authorities in Palestine with the goal of compelling them to leave so a Jewish state could be established. He was assigned to the Combat Corps and adopted the
nom de guerre "Shimon". He took part in two raids on the British military resort camp near Netanya, mining operations against British security traffic, the bombing of a road bridge, and in railway sabotage. On 4 May 1947 he took part in the
Acre Prison break, an attack against
Acre Prison, a British fortress prison in the city of
Acre, during which 28 Jewish underground prisoners were freed. Weiss was part of a blocking squad that laid mines to cover the retreat of the attackers and escapees by delaying any British pursuers. However, Weiss was captured, along with
Avshalom Haviv,
Meir Nakar, Amnon Michaelov, and Nahman Zitterbaum. ==Trial and execution==