from several underground militias to a state army is not simple. Many in the Haganah felt it was their High Command's natural role to become the leadership of the new army. The First Law of the Provisional State Council, Paragraph 18, of the Order of Government and Legal Arrangement stated that "the Provisional Government is empowered to set up armed forces on land, sea and air, which will be authorised to carry out all necessary and legal actions for the defence of the country." The sensitivity of this issue is indicated by the delay of two weeks before, on 26 May 1948, David Ben-Gurion, for the Provisional Government, published the Israel Defense Forces Ordinance Number 4. It covered the establishment of the IDF, conscription duties, the oath of allegiance, and the prohibition of any other armed forces. The execution of the Ordinance was assigned to the Minister of Defence, David Ben-Gurion. His priority was the dissolution of military organisations affiliated to political parties. This led to a series of confrontations with leaders of the Palmach known as The General's Revolt. The army was officially set up on 31 May. This involved renaming existing Haganah and Palmach Brigades and bringing them under one central command. Its officers began to take their oaths of allegiance on 27 June. Lehi and Irgun came under central control in the following months. Despite several further ordinances the actual role and responsibilities of the Minister of Defense were not defined. Nor was there any legal definition of the Cabinet's civil authority over the army. 1949–1956 In those years the IDF started to rebuild itself as a modern army. It acquired heavier weapons and established an armored corps and the Israeli Air Force. In order to enhance the morale and organization of the army and to combat the resurgent problem with Palestinian infiltration, Unit 101 was formed. It was led by Ariel Sharon, and carried out a number of retaliatory strikes on Jordanian territory to deter the infiltrators. After committing the notorious Qibya Massacre in 1953 it was merged with the Paratroopers Battalions and Sharon became its commander. Unit 101 is regarded as the mother of the IDF's strike force units. In those years the IMI Uzi SMG and the FN FAL rifle were issued as standard infantry weapons. The 1956 Sinai campaign From 1954 and 1955 Egypt established a special force unit known as the Fedayeen.