26-30.4.1925 – Hatzohar (Union of Zionist Revisionists) established in Paris. Among decisions: demand for mass immigration and Jewish majority in Eretz Israel.

10.4.1931 - National Military Organization in the Land of Israel (Etzel, Irgun B, Hagana B, National Defense) founded. Avraham Tehomi (Gideon) stood at head of the "Secessionists" from ranks of the "Hagana".

12-15.4.1931 – At first Betar World Conference in Danzig, Jabotinsky elected Betar Head. Decided were principle of defensive training, predominance of Hebrew and principle of recruitment .

17.4.1933 – Hundreds of Leftist organized members attacked Betar members on march on Allenby Street. Most Betar members injured. Mayor Dizengoff of Tel Aviv condemned attackers.

28.4.1933 – Zeev Jabotinsky speaks on Radio Warsaw, calling for world boycott of Germany in response to its anti-Semitic policy, and also calling to establish a Jewish state in Eretz Israel, as response to threat of Hitler.

9.4.1934 - National Labour Organisation in Eretz Israel founding conference opens in Jerusalem, with message read from Jabotinsky about social justice, the 'Five Basics', binding arbitration and Hebrew labor.

24.4.1934 – Appearance of 'HaYarden', Brit Hatzohar in Eretz Israel journal, first edited by Benzion Netanyahu. Published intermittently until 1939, sometimes under other titles, to evade orders of British authorities.

16.4.1947 – Etzel fighters Dov Gruner, Yehiel Dov Dresner, Eliezer Kashani and Mordechai Alkahi hanged in Acre Prison.

9.4.1948 – Deir Yassin village captured by Etzel and Lehi forces launching Arab defeat in Eretz Israel during Independence War. Arab losses numbered between 80–100. Four Etzel and one Lehi fighter killed.