As the Etzioni Brigade had a smaller operational (
Field Corps) force than the other brigades, it never left the Jerusalem theatre. In all, it suffered between 592 and 651
killed in action in the battles for Jerusalem and
Gush Etzion, more than any other brigade's KIA in the entire war. Because of the lack of manpower and training among the Guard Corps units, during the first stages of the war Etzioni was mostly confined to guard duties, with no reserve units for initiating attacks. The Etzioni Brigade participated in
Operation Yevusi (April–May 1948), the first operation in Haganah history that was carried out by more than one brigade, the other one being
Harel. The 61st Battalion captured the
Katamon neighbourhood on May 2–3 and connected with the previously isolated
Mekor Haim. Upon British withdrawal from Jerusalem in May 1948, after
Operation Shfifon in the Old City, Etzioni, assisted by
Irgun and
Lehi paramilitaries, initiated
Operation Kilshon to capture the areas formerly held by the British.
Sheikh Jarrah and the areas between
Yemin Moshe and
Rehavia were taken on May 14, followed by the
German and
Greek colonies,
Baka, Camp Allenby, and most of "Bevingrad" on May 15.
Abu Tor was captured on May 17–18, ending the operation. After Kilshon, Etzioni made further small gains by capturing the
Notre Dame Monastery next to the
New Gate on May 17–18. A simultaneous attack at the
Tower of David failed. Following the Jordanian
Arab Legion's capture of Sheikh Jarrah and entrance to the Old City, all Israeli units in Jerusalem engaged it, including Etzioni, especially in northern Jerusalem between
Sanhedriya and the Notre Dame. An attack by the Legion on
Mount Scopus was repelled mostly by Etzioni troops stationed there. The brigade was a major participant in the battles of
Ramat Rachel. On May 22, the kibbutz was taken and looted by Egyptian
Muslim Brotherhood forces after heavy shelling. At 17:00, a unit from the 61st Battalion retook the village and handed it over to its Guard Corps units. This failed, and on May 23, the Arabs again captured the village. Etzioni recaptured it on the same night, leaving 75 defenders, 50 Irgun and 25 Etzioni. The third joint Muslim Brotherhood – Arab Legion attack came on May 24 and was mainly fended off by Irgun units. Etzioni and Harel reinforcements drove the Arab forces out and captured the
Mar Elias Monastery to the southwest. During the
Battles of the Ten Days, Etzioni was set to significantly expand Jewish control of Jerusalem and its surroundings, including capturing the Old City. In northern Jerusalem, the initiative was held by the Arab Legion, which attacked
Mandelbaum and
Musrara and drew IDF units to the area. Despite this, Etzioni and regional
Gadna units managed to take the
Zion Gate,
al-Maliha and
Ein Karim on July 10–16. Etzioni's 62nd Battalion participated in
Operation Kedem on July 16–17, to take over the Old City in a frontal assault, due to a lack of time imposed by the impending ceasefire, but failed to breach its walls. Despite some successes, the operation came to a halt with the announcement of the ceasefire. After the second truce of the war, Etzioni participated in Operation Yekev, meant to capture the mountains of
Beit Jala, but failed in its mission and retreated. They took part in
Operation Ha-Har, which cleared villages west of Jerusalem. ==After the 1948 Arab–Israeli War==