HMS Pegasus was a British warship, a light cruiser of the Pelorus-class, that met a tragic fate during World War I. Her sinking on September 20, 1914, off the coast of Mombasa, British East Africa (now Kenya), was one of the earliest naval losses for Britain in the war. The attack by the German cruiser SMS Königsberg turned the waters near Mombasa into a battlefield, marking a significant moment in the naval conflicts of World War I.
HMS Pegasus: The Warship and Her Mission
HMS Pegasus was built in the late 1890s and was part of Britain's Royal Navy. She was a Pelorus-class protected cruiser, a type of small cruiser designed for colonial service. By the time World War I broke out in August 1914, Pegasus was already an outdated vessel, not suited for modern naval warfare.
At the start of the war, Pegasus was stationed in the Indian Ocean as part of Britain’s efforts to secure its territories and shipping lanes from German threats. Her primary mission was to track and counter German naval forces, particularly the SMS Königsberg, a powerful German cruiser that had been disrupting British trade routes along the East African coast.
The Threat of SMS Königsberg
The German cruiser
SMS Königsberg was a formidable warship, faster and more heavily armed than Pegasus. In early September 1914, Königsberg was hiding in the Rufiji River delta (modern-day Tanzania) to make repairs. The British forces were aware of her presence and were trying to locate and neutralize her.
Meanwhile, Pegasus had suffered from engine problems and was forced to dock at Zanzibar for much-needed repairs. This made her vulnerable, as she was unable to maneuver or defend herself properly.
The Attack on HMS Pegasus
At dawn on September 20, 1914, SMS Königsberg launched a surprise attack on the defenseless Pegasus. The German cruiser approached the harbor of Zanzibar, catching the British ship completely off guard.
At around 5:30 AM, Königsberg opened fire from a distance of about 9,000 yards (8,200 meters). HMS Pegasus, unable to move due to engine repairs, returned fire, but her outdated 4-inch guns were no match for the 4.1-inch (10.5 cm) guns of the German warship.
Within just 20 minutes, the attack devastated Pegasus. The British cruiser was hit multiple times, causing severe damage to her hull and superstructure. The gunfire destroyed her main armaments, killed many crew members, and set the ship ablaze.
The Sinking of HMS Pegasus
After being severely damaged, Pegasus began to list and eventually sank later that day in the shallow waters of Zanzibar harbor. Though many crew members survived, 38 sailors lost their lives, and many others were seriously wounded.
The wreck of Pegasus remained visible in the harbor for some time before eventually being scrapped. The ship’s sinking was a serious blow to British naval power in the region and highlighted the threat posed by German raiders in the Indian Ocean.

Aftermath and Legacy
The loss of HMS Pegasus forced the British to take stronger action against Königsberg. Over the next few months, British forces, including warships and aircraft, launched operations to locate and destroy the German cruiser. Eventually, in July 1915, SMS Königsberg was trapped and sunk in the Rufiji Delta by British warships.
Despite her tragic fate, Pegasus and her crew are remembered as part of Britain’s naval history in World War I. The battle off Mombasa in 1914 was one of the first naval engagements of the war and demonstrated the vulnerability of older ships against more modern warships.
Conclusion
The story of HMS Pegasus is one of bravery, tragedy, and the dangers of naval warfare during World War I. Though she was outmatched by SMS Königsberg, her crew fought courageously despite being at a disadvantage. Today, the sinking of HMS Pegasus remains a significant event in the history of the Royal Navy’s early war efforts in Africa.