In the 1948 Arab-Israeli War, Kfar Yona was on the front lines, and its defenders faced the Iraqi Army, which sought to reach Netanya and cut the Jewish forces in Israel in half. The new Israel Defense Forces repelled the Iraqi attacks and forced them back into the Samarian mountains, although Kfar Yona remained the easternmost Jewish settlement in the area. As a result of the 1949 Armistice Agreements, the border moved from Kfar Yona 8 km eastward, to just west of Tulkarm.