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On the sign:
סמל הגדוד החמישי
במבצע "נחשון" ו"הראל" ד-ח בניסן תש"ח 13-17 באפריל 1948
The battalions participation in Operation Nachshon is indicated on another sign Click for sign's details
Operation Harel was, in fact, a continuation of Operation Nachshon, in which three convoys containing more than 600 vehicles were transferred to Jerusalem. As part of this operation, all the soldiers of the battalion were taken to Jerusalem in one of the convoys (Harel Convoy).
Translation of the text on the sign: Emblem of the Fifth Battalion