Independent raider

Route taken by Emden during commerce raiding operations

On 14 August, Emden and Markomannia left the company of the East Asia Squadron, bound for the Indian Ocean. Since the cruiser Königsberg was already operating in the western Indian Ocean around the Gulf of Aden, Müller decided he should cruise in the shipping lanes between Singapore, Colombo and Aden. Emden steamed toward the Indian Ocean by way of the Molucca and Banda Seas. While seeking to coal off Jampea Island, the Dutch coastal defense ship Maarten Harpertszoon Tromp stopped Emden and asserted Dutch neutrality. Müller steamed into the Lombok Strait. There, Emden's radio-intercept officers picked up messages from the British armored cruiser HMS Hampshire. To maintain secrecy, Emden's crew rigged up a dummy funnel to impersonate a British light cruiser, then steamed up the coast of Sumatra toward the Indian Ocean.^[20]

On 5 September, Emden entered the Bay of Bengal,^[21] achieving complete surprise, since the British assumed she was still with Spee's squadron.^[22] She operated on shipping routes there without success, until 10 September, when she moved to the Colombo–Calcutta route. There, she captured the Greek collier SS Pontoporos, which was carrying equipment for the British. Müller took the ship into his service and agreed to pay the crew. Emden captured five more ships;^[23] troop transports Indus and Lovat and two other ships were sunk, and the fifth, a steamer named Kabinga, was used to carry the crews from the other vessels.^[24] On 13 September, Müller released Kabinga and sank two more British prizes. Off the Ganges estuary, Emden caught a Norwegian merchantman, which the Germans searched; finding no contraband they released her. The Norwegians informed Müller that Entente warships were operating in the area, which persuaded him to return to the eastern coast of India.^[23]

Emden stopped and released an Italian freighter, whose crew relayed news of the incident to a British vessel, which in turn informed British naval authorities in the region. The result was an immediate cessation of shipping and the institution of a blackout. Vice Admiral Martyn Jerram ordered Hampshire, Yarmouth, and the Japanese protected cruiser Chikuma to search for Emden. The British armored cruiser Minotaur and the Japanese armored cruiser Ibuki were sent to patrol likely coaling stations.^[23]

Oil tanks burning at Madras

In late September, Müller decided to bombard Madras. Müller believed the attack would demonstrate his freedom of maneuver and decrease British prestige with the local population. At around 20:00 on 22 September, Emden entered the port, which was completely illuminated, despite the blackout order. Emden closed to within 3,000 yards (2,700 m) from the piers before opening fire. She set fire to two oil tanks and damaged three others, and damaged a merchant ship in the harbor. In the course of the bombardment, Emden fired 130 rounds. The following day, the British again mandated that shipping stop in the Bay of Bengal; during the first month of Emden's raiding career in the Indian Ocean, the value of exports there had fallen by 61.2 percent.^[23]

From Madras, Müller had originally intended to rendezvous with his colliers off Simalur Island in Indonesia, but instead decided to make a foray to the western side of Ceylon. On 25 September, Emden sank the British merchantmen Tywerse and King Lund two days before capturing the collier Buresk, which was carrying a cargo of high-grade coal. A German prize crew went aboard Buresk which was used to support Emden's operations. Later that day, the German raider sank the British vessels Ryberia and Foyle.^[25] Low on fuel, Emden proceeded to the Maldives, arriving on 29 September and remaining for a day while coal stocks were replenished. The raider then cruised the routes between Aden and Australia and between Calcutta and Mauritius for two days without success. Emden steamed to Diego Garcia for engine maintenance and to rest the crew.^[23]

The British garrison at Diego Garcia had not yet learned of the state of war between Britain and Germany, and so treated Emden to a warm reception. She remained there until 10 October, to remove fouling. While searching for merchant ships west of Colombo, Emden picked up Hampshire's wireless signals again; the ship had departed for the Chagos Archipelago on 13 October.^[26] The British had captured Markomannia on 12 October, depriving Emden of a collier.^[22] On 15 October, Emden captured the British steamer Benmore off Minikoi and sank her the next day. Over the next five days, she captured Troiens, Exfort, Graycefale, Sankt Eckbert, and Chilkana.^[25] One was used as a collier, three were sunk, and the fifth was sent to port with the crews of the other vessels. On 20 October, Müller decided to move to a new area of operations.^[26]

Attack on Penang

Map showing Emden's movements during the battle

Müller planned a surprise attack on Penang in British Malaya. Emden coaled in the Nicobar Islands and departed for Penang on the night of 27 October, with the departure timed to arrive off the harbor at dawn. She approached the harbor entrance at 03:00 on 28 October, steaming at 18 kn (33 km/h; 21 mph), with the fourth dummy funnel erected to disguise her identity. Emden's lookouts quickly spotted a warship in the port with lights on; it turned out to be the Russian protected cruiser Zhemchug,^[26] a veteran of the Battle of Tsushima.^[27] Zhemchug had put into Penang for boiler repairs; only one was in service, which meant that she could not get under way, nor were the ammunition hoists powered. Only five rounds of ready ammunition were permitted for each gun, with a sixth chambered.^[28] Emden pulled alongside Zhemchug at a distance of 300 yards (270 m); Müller ordered a torpedo to be fired at the Russian cruiser, then gave the order for the 10.5 cm guns to open fire.^[26]

Emden quickly inflicted grievous damage on her adversary, then turned around to make another pass at Zhemchug. One of the Russian gun crews managed to get a weapon into action, but scored no hits. Müller ordered a second torpedo to be fired into the burning Zhemchug while his guns continued to batter her. The second torpedo caused a tremendous explosion that tore the ship apart. By the time the smoke cleared, Zhemchug had already slipped beneath the waves, the masts the only parts of the ship still above water.^[29] The destruction of Zhemchug killed 81 Russian sailors and wounded 129, of whom seven later died of their injuries. The elderly French torpedo cruiser D'Iberville and the destroyer Fronde opened wildly inaccurate fire on Emden.^[30]

Müller then decided to depart, owing to the risk of encountering superior warships. Upon leaving the harbor, he encountered a British freighter, SS Glen Turret, loaded with ammunition, that had already stopped to pick up a harbor pilot. While preparing to take possession of the ship, Emden had to recall her boats having spotted an approaching ship. This proved to be the French destroyer Mousquet, which was unprepared and was quickly destroyed. Emden stopped to pick up survivors and departed at around 08:00 as the other French ships were raising steam to get underway.^[31] One officer and thirty-five sailors were plucked from the water. Another French destroyer tried to follow, but lost sight of the German raider in a rainstorm. On 30 October, Emden stopped the British steamer Newburn and put the French sailors aboard after they signed statements promising not to return to the war.^[32][33] The attack on Penang was a significant shock to the Entente powers, and caused them to delay the large convoys from Australia, since they would need more powerful escorts.^[34]

Battle of Cocos

Emden's landing party going ashore on Direction Island; the three-masted Ayesha is visible in the background

After releasing the British steamer, Emden turned south to Simalur, and rendezvoused with the captured collier Buresk. Müller then decided to attack the British coaling station in the Cocos Islands; he intended to destroy the wireless station there and draw away British forces searching for him in the Indian Ocean. While en route to the Cocos, Emden spent two days combing the Sunda Strait for merchant shipping without success. She steamed to the Cocos, arriving off Direction Island at 06:00 on the morning of 9 November. Since there were no British vessels in the area, Müller sent ashore a landing party led by Kapitänleutnant (First Lieutenant) Hellmuth von Mücke, Emden's executive officer. The party consisted of another two officers, six non-commissioned officers, and thirty-eight sailors armed with four machine guns and thirty rifles.^[35][36]

Emden was using jamming, but the British wireless station was able to transmit the message "Unidentified ship off entrance." The message was received by the Australian light cruiser HMAS Sydney, which was 52 nautical miles (96 km; 60 mi) away, escorting a convoy. Sydney immediately headed for the Cocos Islands at top speed. Emden picked up wireless messages from the then unidentified vessel approaching, but believed her to be 250 nautical miles (460 km; 290 mi) away, giving them much more time than they actually had. At 09:00, lookouts aboard Emden spotted smoke on the horizon, and thirty minutes later identified it as a warship approaching at high speed. Mücke's landing party was still ashore, and there was no time left to recover them.^[37]

Sydney closed to a distance of 9,500 yards (8,700 m) before turning to a parallel course with Emden. The German cruiser opened fire first, and straddled the Australian vessel with her third salvo.^[37] Emden's gunners were firing rapidly, with a salvo every ten seconds; Müller hoped to overwhelm Sydney with a barrage of shells before her heavier armament could take effect.^[38] Two shells hit Sydney, one of which disabled the aft fire control station; the other failed to explode. It took slightly longer for Sydney to find the range, and in the meantime, Emden turned toward Sydney in an attempt to close to torpedo range. Sydney's more powerful 6 in (152 mm) guns soon found the range and inflicted serious damage. The wireless compartment was destroyed and the crew for one of the forward guns was killed early in the engagement. At 09:45, Müller turned his ship toward Sydney in another attempt to reach a torpedo firing position. Five minutes later, a shell hit disabled the steering gear, and other fragments jammed the hand steering equipment. Emden could only be steered with her propellers. Sydney's gunfire also destroyed the rangefinders and caused heavy casualties amongst Emden's gun crews.^[39]

Emden beached on North Keeling Island

Müller made a third attempt to close to torpedo range, but Sydney quickly turned away.^[40] Shortly after 10:00, a shell from Sydney detonated ready ammunition near the starboard No. 4 gun and started a serious fire. Emden made a fourth and final attempt to launch a torpedo attack, but Sydney was able to keep the range open. By 10:45, Emden's guns had largely gone silent; the superstructure had been shredded and the two rear-most funnels had been shot away, along with the foremast. Müller realized that his ship was no longer able to fight, and beached Emden on North Keeling Island to save the lives of his crew. At 11:15, Emden was run onto the reef, and the engines and boilers were flooded. Her breech blocks and torpedo aiming gear were thrown overboard to render the weapons unusable, and all signal books and secret papers were burned. Sydney turned to capture the collier Buresk, whose crew scuttled her when the Australian cruiser approached. Sydney then returned to the wrecked Emden and inquired if she surrendered. The signal books had been destroyed by fire and so the Germans could not reply, and since her flag was still flying, Sydney resumed fire. The Germans quickly raised white flags and the Australians ceased fire.^[40][41]

In the course of the action, Emden scored sixteen hits on Sydney, killing three of her crew and wounding another thirteen.^[42] A fourth crewman died later from his injuries.^[43] Sydney had meanwhile fired some 670 rounds of ammunition, with around 100 hits claimed.^[44] Emden had suffered much higher casualties: 133 officers and enlisted men died,^[45] out of a crew of 376. Most of the surviving crew, including Müller, were taken into captivity the next day. The wounded men were sent to Australia, while the uninjured were interned at a camp in Malta; the men were returned to Germany in 1920.^[46][47] Mücke's landing party evaded capture. They had observed the battle, and realized that Emden would be destroyed. Mücke therefore ordered the old 97 gross register ton schooner Ayesha to be prepared for sailing. The Germans departed before Sydney reached Direction Island, and sailed to Padang in the Dutch East Indies. From there, they traveled to Yemen, which was then part of the Ottoman Empire, an ally of Germany. They then traveled overland to Constantinople, arriving in June 1915. There, they reported to Vizeadmiral Wilhelm Souchon, the commander of the ex-German battlecruiser Goeben.^[42] In the meantime, the British sloop Cadmus arrived at the Cocos Islands about a week after the battle to bury the sailors killed in the battle.^[48]