After the First World War began in 1914, HMS B10 played a minor role in the Dardanelles Campaign.
Two members of the crew were washed overboard when the submarine was charging batteries during a patrol North of the island of Tenedos in the Aegean Sea. One was picked up but died without regaining consciousness. The other was not recovered.
Although no further loss of life was involved, HMS B10 subsequently became the first submarine in history to be sunk by air attack, on 10 August 1916, whilst berthed alongside the Italian cruiser Marco Polo in Venice. The raid was led by Austro-Hungarian ace Baron Gottfried Freiherr Von Banfield who earnt himself an obituary in the Times when he died in 1986.
B10 was raised and docked but during a repair to the damage a petrol tank was ignited and the resulting fire put an end to the submarine’s career.