During the early hours of 8 June "I-24" and "I-21" carried out brief bombardments of Sydney and Newcastle respectively. The purpose of these attacks was to generate what historian David Jenkins has called an "air of disquiet" rather than inflict significant damage on targets in the two cities. Between 00:15 and 00:20 "I-24" fired ten shells which landed in the suburbs of Bellevue Hill, Rose Bay and Woollahra. Only one of these shells exploded, and they caused little damage and only injured one person. While the Sydney Harbour defences spotted "I-24"s gun flashes, the submarine ceased its attack and submerged before the Australian gunners could open fire on it.