The MACs were very different from one another, bringing about four unique peacekeeping missions under the head of the UNTSO. Disputes on the Israel/Syria Mixed Armistice Commission (ISMAC) centred on the most precious Middle Eastern commodity: water and sovereignty of the DMZ. Contentious issues in the HKJIMAC principally concerned the divided city of Jerusalem, the Israeli Mount Scopus enclave, the Latrun salient (sovereignty of the DMZ), Arab infiltration across the armistice demarcation line and large scale Israeli military incursions into Jordanian territory. The troubles were followed by infiltration from displaced Arabs, followed by raids of reprisal and intimidation by the Israelis, which heightened tensions around the borders. The infiltration by Palestinians initially consisted of unarmed groups crossing to regain possessions, harvest their crops or visit relatives, but later infiltrations included armed individuals and then later developed into small retaliatory raids.