 Concerned with the threat Königsberg posed to troop transports from India , the British reinforced the flotilla tasked with tracking down the elusive German raider , and placed the ships under the command of Captain Sidney R. Drury @-@ Lowe . The sinking of Pegasus convinced the British that Königsberg must still be in German East Africa . On 19 October , the cruiser Chatham found the German East Africa Line ship <unk> at Lindi . A boarding party searched the ship and discovered documents indicating she had supplied Königsberg with coal in the Rufiji the previous month . On 30 October , the cruiser Dartmouth located Königsberg and Somali in the delta . The cruisers Chatham , Dartmouth , and Weymouth blockaded the Rufiji Delta to ensure Königsberg could not escape . 
