As May 15 drew closer, the two peoples continued preparing for war. However, the Jewish intelligence learned that, although the mandate was set to expire on May 15, the British were planning to leave on May 14. Prepared for the early departure, the Haganah mobilized quickly and managed to capture many British buildings before the Arabs even realized that the British had left. Not privy to this intelligence, the Arab armies activated on May 15. The Jewish homeland of Israel was declared on Iyar 5, 5708 Hebrew, or May 14, 1948, Gregorian. Today, this day is celebrated as Yom Ha'atzmaut, or Israeli Independence Day.