After the expiration of the mandate, war befell the region. The Arab armies underestimated the Haganah's strength and were not prepared for a strong foe. Both the Arab and Jewish armies suffered major shortcomings in ammunition and manpower. The situation in Jerusalem worsened, leaving Jewish Jerusalemites near starving. On June 11, 1948, a UN sanctioned cease-fire began. Jerusalem's starving were saved by a temporary end to the siege. Jerusalem's storerooms and stomachs were filled again. By cease-fire agreement, neither army was allowed to re-arm itself, but the Haganah was able to buy arms through the black market. The Arab armies, however, were not. After four weeks, the fighting began again, followed by another cease-fire beginning on July 19 (July 17 in Jerusalem), 1948 (O Jerusalem! Collins).