1 March – Zionist activist Joseph Trumpeldor and five Palestinian Jewish fighters are killed in the battle of Tel Hai. The battle, which gave Tel Hai its long-enduring fame, was significant far beyond the small number of fighters involved on either side - mainly due to its influence on Zionist history, both inspiring an enduring heroic myth and profoundly influencing Zionist military and political strategies over several decades.
26 April – The San Remo conference ends, during which the Allied Supreme Council agree to allocate the mandate of Palestine (including the Transjordanian region) to the United Kingdom, incorporating the terms set forth in the Balfour Declaration of 1917. However, at this time the frontier of British controlled territory and the Palestinian administration continues to be the Jordan river. Transjordan, east of the river, remains part of the Arab Kingdom of Syria.
12 June – Following the Battle of Tel Hai, the Jewish leadership in Palestine establishes the Jewish paramilitary organisation "Haganah" to protect Jewish farms and kibbutzim, believing that the Jewish population in Palestine could not rely on the British administration for protection from the frequent attacks carried out by local Arab gangs against Palestinian Jews.
30 June - Two Arabs shot dead by British troops during demonstrations in Jaffa following the landing of new Jewish immigrants.
7 August – SirHerbert Louis Samuel's request to extend the frontier of British territory beyond the Jordan river and to bring Transjordan under his administrative control is rejected. The British Foreign Secretary, Lord Curzon, proposed instead that British influence in Tranjordan should be advanced by sending a few political officers, without military escort, to encourage self-government and give advice to local leaders in the territory.
10 August – The Treaty of Sèvres endorses the allocation to the United Kingdom of a mandate of Palestine. The treaty is stillborn and subsequently superseded by the Treaty of Lausanne.