In 1918, the leading British secret agent in Petrograd, as St Petersburg was then known, was Paul Dukes, code number ST/25. In order to provide a courier service for Dukes two Coastal Motor Boats were based, with the consent of the Finnish authorities, at the Terijoki yacht club on the Finnish of part of the Gulf of Finland, 25 miles from Petrograd and the adjacent Bolshevik naval base at Kronstadt. Augustus Agar, a 29 year old Royal Navy Lieutenant was given command of the CMBs. He was code numbered ST /34.
The first CMBs, called 40 footers although they were actually 45 feet long, had a speed of 24.8 knots, an armament of a stern launched 18 inch torpedo and two or four .303 inch Lewis machine guns and a crew of two or three. Later 40 footers had more powerful engines, giving them a maximum speed of 35.1 – 37.8 knots. The subsequent 55 footers were armed with one or two 18 inch torpedoes, four Lewis guns and four depth charges. They had a crew of three to five and could make 35.25 – 41.2 knots. The later 70 footers were minelayers with six Lewis guns, seven mines or 3 torpedoes, four depth charges, a crew of three to five and a maximum speed of 26 -36 knots depending on their engines.
Agar had qualified as a pilot before the war, but did not serve with the Royal Naval Air Service. He served pre-dreadnought battleship HMS Hibernia, including at Gallipoli, and then in the elderly cruiser HMS Iphigenia, which acted as a depot ship for minesweepers covering the supply routes to Archangel and Murmansk in North Russia. In May 1918, he was assigned to a flotilla of CMB operating from the Essex coast. 
Agar successfully landed a courier near Petrograd in June. Dukes then ordered that there should be no more missions until mid-July because of the short nights. Agar then signalled Captain Sir Mansfield Smith-Cumming RN, the head of the British Secret Intelligence Service, requesting permission to take action in support of an anti-Bolshevik Russian garrison that was being bombarded by Bolshevik naval forces. Cumming replied that the CMBs were to be used only for intelligence purposes unless otherwise ordered by the Senior Naval Officer Baltic.
The SNO was Admiral Walter Cowan, an aggressive officer, and Agar was confident that Cowan would retrospectively support any action that he took. On 16 June, his first attempt to attack the Kronstadt Island naval base next to Petrograd had to be abandoned after one of the CMBs broke down. The next night Agar, commanding the 40 footer CMB4, succeeded in sinking the 6,650 ton cruiser Oleg. On 19 August 1919 the award of the Victoria Cross to Agar was announced. See Naval-History.net for the citation.
Agar made two unsuccessful attempts to pick up Dukes. The first time, a Bolshevik patrol spotted Dukes’s courier. The second attempt failed because their rowing boat sank.
On the night of 17-18 August, Agar in the 40 footer CMB7 led a flotilla of 55 footer CMBs into Kronstadt. He piloted the other boats into the harbour under heavy fire and then covered their withdrawal, again under heavy.
The 55 footers were of two types. The A boats carried one 18 inch torpedo and were capable of 35.25 knots. The BD type had two 18 inch torpedoes and a maximum speed of 35.1 knots.
The flotilla was commanded by 34 year old Commander Claude Dobson, DSO in CMB 31BD. He had previously served in submarines and CMBs. He directed the attack and then torpedoed the 17,400 ton pre-dreadnought battleship Andrei Pervozvanny, before retiring under heavy fire.
Lieutenant Archibald Dayrell-Reed, captain of CMB 88BD was shot in the head and the boat thrown off course. Second in command 26 year old Lieutenant Gordon Steele took the wheel. moved Dayrell-Reed away from the steering and firing position and torpedoed the Andrei Pervozvanny. He then manoeuvred to get a clear shot at the 23,360 ton dreadnought Petropavlovsk, which was partly overlapped by the Andrei Pervozvanny and further obscured by smoke coming from her. However, he managed to fire a torpedo her and to turn away in a tight space, firing his machine guns as his boat exited the harbour under heavy fire. The elderly Russian cruiser Pamiat Azova, which was being used as a torpedo boat depot ship, was sunk by the CMBs.
The Andrei Pervozvanny was not repaired and was scrapped in 1923. The British claimed to have sunk the Petropavlosk in shallow water but the Soviets insisted that she was not damaged. She was renamed Marat and recommissioned in 1922. She was badly damaged by German dive bombers in 1941 at Kronstadt but enough of her hull remained above water for her to be used as a gun battery.
CMB25BD, captained by 25 year old Russell McBean, who had been an early volunteer for CMBs and was awarded the Distinguished Service Cross after the second Ostend Raid, also torpedoed the Andrei Pervozvanny, before withdrawing under heavy fire.
Acting Sub Lieutenant Edward Bodley, RNR’s CMB72A attacked a Bolshevik destroyer, but the CMB’s steering broke down. It encountered Acting Sub Lieutenant Francis Howard’s CMB86BD, whose engines had broken down and it took in tow.
The other three CMBs were lost: 25BD, 31BD and 72A. Four officers, including Dayrell-Reed, and four petty officers and ratings were killed. They are listed on Naval-History.net.
Dobson and Steele were both awarded the VC and Agar, McBean and Bodley the Distinguished Service Order. Their citations, published on 11 November 1919 are available on Naval-History.net: VC here and DSO here. Six other officers, including Howard, were awarded the DSC. The award of Distinguished Service Medals to a number of petty officers and ratings for operations in Russia at the same time, but no details of how, where and when they were earned was given.
Agar was a Captain in 1939, commanding the cruiser HMS Emerald. She and her sister ship HMS Enterprise transported five tons of gold to Nova Scotia in order to pay for war materials before the later introduction of Lend Lease. He then commanded a destroyer flotilla and was chief staff officer, coastal forces, before in August 1941 taking command of the heavy cruiser HMS Dorsetshire.
On 5 April 1942 Dorsetshire and her sister ship HMS Cornwall were sunk by Japanese dive bombers in the Indian Ocean. Agar survived but was wounded in the leg, swallowed oil and suffered from the bends, which damaged his lungs. He recovered from the leg wound but was unfit for further sea service. He was President and Captain of the Royal Naval College, Greenwich with the rank of Commodore from 1943-46. He then retired and became a farmer, dying in 1969.
His medals are in the Imperial War Museum in London and CMB4 is in the IWM’s Duxford branch.
Dobson reached the rank of Rear Admiral retiring in 1935 and dying in 1940. His VC is held by the National Maritime Museum, Greenwich.
Steele was Captain Superintendent of HMS Worcester, a training college for Royal and Merchant Navy Officers from 1929 to 1957, apart from World War II, when he returned to the RN. He was featured in the TV programme This is Your Life in 1958, when he once again met Bodley, who had retired as Commodore of the P&O Line the year before. Steele’s VC belongs to Trinity House. He died in 1981.
MacBean retired from the RN as a Captain after the Second World War and died in 1963.
 K. Jeffery, MI6: The History of the Secret Intelligence Service, 1909-1949, pp. 175-76.
 R. Gray, Conway’s All the World’s Fighting Ships, 1906-1921, p. 100.
 H. C. G. Matthew et al, “Oxford Dictionary of National Biography”, Oxford University Press <<http://www.oxforddnb.com/subscribed>>. Accessed 17 June 2019.
 Jeffery, MI6, p. 176.
 Gray, Conway’s 1906-1921, p. 100.
 Ibid., p. 303.