Operation Nachshon was an Israeli military operation during the 1947-1948 Civil War in Mandatory Palestine.
Its objective was to open up the Jerusalem road that was blockaded by Palestinian Arabs and to supply food and water to the Jewish community of Jerusalem. It was the first major Haganah operation and the first step of Plan Dalet whose aim was to secure the area allotted to the Jews by the 1947 UN Partition Plan. The operation was carried out by the Givati and Harel Brigades.
It was during Operation Nachshon that the Deir Yassin massacre took place on April 9, where around 107 Palestinian villagers, including women and children, were killed by Irgun and Lehi fighters.