repulsed. The rebels later attacked a nearby Christian mission and during the night fled from Mbombwe to Portuguese East Africa. On 26 January government forces took Mbombwe unopposed and Chilembwe was later killed by a police patrol, near the border with Portuguese East African border. In the repression after the rebellion, more than were killed and were imprisoned. Naval operations, 1914–1916 Battle of the Rufiji Delta, 1915 A light cruiser, of the Imperial German Navy, was in the Indian Ocean when war was declared. Königsberg sank the cruiser HMS Pegasus in Zanzibar City harbour and then retired into the Rufiji River delta. After being cornered by warships of the British Cape Squadron, two monitors, and , armed with guns, were towed to the Rufiji from Malta by the Red Sea and arrived in June 1915. On 6 July, clad in extra armour and covered by a bombardment from the fleet, the monitors entered the river. The ships were engaged by shore-based weapons hidden among trees and undergrowth. Two aircraft based at Mafia Island observed the fall of shells, during an exchange of fire at a range of with Königsberg, which had assistance from shore-based spotters. Mersey was hit twice, six crew killed and its gun disabled; Severn was straddled but hit Königsberg several times, before the spotter aircraft returned to base. An observation party was seen in a tree and killed and when a second aircraft arrived both monitors resumed fire. German return fire diminished in quantity and accuracy and later in the afternoon the British ships withdrew. The monitors returned on 11 June and hit Königsberg with the eighth salvo and within ten minutes the German ship could only reply with three guns. A large explosion was seen at At seven explosions occurred. By Königsberg was a mass of flames. The British salvaged six guns from the Pegasus, which became known as the Peggy guns, and the crew of Königsberg salvaged the main battery guns of their ship and joined the . Lake Tanganyika expedition, 1915 The Germans had maintained control of the lake since the outbreak of the war, with three armed steamers and two unarmed motorboats. In 1915, two British motorboats, and (Commander Geoffrey Spicer-Simson), each armed with a 3-pounder gun and a Maxim gun, were transported by land to the British shore of Lake Tanganyika. The British captured the German ship Kingani on 26 December, renamed