 Complete the following phrase:  Königsberg then retreated into the Rufiji River to repair her engines. Before the repairs could be completed, British cruisers located Königsberg; the Navy List for April 1915 lists on the East Coast of Africa under Part XI, Other Foreign Stations, page 22 1363, the light cruisers Hyacinth, , and . Unable to steam into the river to destroy Konigsberg, the Royal Navy ships set up a blockade. Aircraft were sent to join the effort and Squadron Commander Robert Gordon was appointed in January 1915 as commander of the Royal Naval Air Service in East Africa. After several attempts to sink the ship during the 