It involved Israel allegedly smuggling weapons through Jordanian territory, violating the General Armistice Agreement by sending soldiers into no-man's land, and taking over the UN MAC headquarters with armed force.

After the 1948 Arab–Israeli War, Jordan had control of Mount Olives with exception of land containing the Hadassah Medical Center and Hebrew University of Jerusalem, which were under administration by the United Nations who allowed Israel to maintain police guards in these areas under UNTSO supervision.

[1] Every two weeks, a convoy would cross from Jerusalem into Jordanian territory through Mandelbaum Gate to provide supplies and a change of guard to the Israeli police force.

[citation needed] On June 4, during a regular convoy check, a UN guard dropped a test rod into an oil drum, which struck a metal object in the center, and was unable to reach the bottom.

A scene was set in which Commandant Delseries attempted to reach for the lock of the door leading to the barrel room to which the Israeli guards would block him, and Schofield would take a picture of it.

[1] When General Riley arrived he successfully demanded the withdrawal of the aide-mémoire for the photograph and condemned Israel both for crossing into no man's land and for taking over UN Headquarters.

That was repeated until General Riley determined that the barrel contained matter other than fuel oil, which violated manifest as an item not part of the convoy, and he ordered it returned to Israel.