The Irgun stepped up its activity and from February 19 until March 3 it attacked 18 British military camps, convoy routes, vehicles, and other facilities. The most notable of these attacks was the bombing of a British officer's club located in Goldsmith House in Jerusalem, which was in a heavily guarded security zone. Covered by machine-gun fire, an Irgun assault team in a truck penetrated the security zone and lobbed explosives into the building. Thirteen people, including two officers, were killed. As a result, martial law was imposed over much of the country, enforced by approximately 20,000 British soldiers. Despite this, attacks continued throughout the martial law period. The most notable one was an Irgun attack against the Royal Army Pay Corps base at the Schneller Orphanage, in which a British soldier was killed.