Second World War
On 27 August 1939, a few days before the Second World War began, Britannic was requisitioned as she was returning from New York. She was converted into a troop ship at Southampton. A few days later left she embarked British Indian Army officers and naval officers, whom she then took from Greenock to Bombay.[29] While in Bombay she was fitted with one BL 6-inch Mk XII naval gun for defence against surface craft and one QF 3-inch 20 cwt high-angle gun for anti-aircraft defence[30] to make her a defensively equipped merchant ship.
Britannic loaded cargo, returned to England and then returned to commercial service between Liverpool and New York.[31] By January 1940 her superstructure had been repainted from white to buff, and a pillbox had been built on each wing of her bridge as protection for the deck officer on watch.[30]
By January 1940, UK passenger ships, including Britannic, displayed posters warning passengers "BEWARE. Above all, never give away the movements of His Majesty's ships." Crews were warned that disclosing information such as ship movements violated the Defence of the Realm Act 1914.[32]
But in the US, which remained neutral until December 1941, newspapers continued to publish the arrival and departure of every Allied passenger liner.[33] In April 1940 The New York Times even published how many UK Merchant Navy seafarers arrived on Britannic and the Cunard liner RMS Cameronia (1919) to join which cargo ships, and even gave some idea where those cargo ships were.[32]
On 20 February 1940 an anonymous telephone call to the New York City Police Department warned that a bomb would be planted aboard Britannic. NYPD officers searched the ship but found nothing.[34]
Britannic's westbound crossings carried many refugees from central Europe,[35] including Germans fleeing Nazism.[30][32] She also carried many UK children sent to North America[35] by the Children's Overseas Reception Board. The overseas evacuation of children was terminated after a U-boat tragically torpedoed the Ellerman Lines ship SS City of Benares on 17 September 1940, sinking it within 31 minutes, and killing 258 people, including 81 of 100 children on board.
In January 1940 the pianist Harriet Cohen travelled on Britannic to begin a concert tour of the US.[30] On the same voyage Britannic also carried eight racehorses that had been sold to US buyers. Five of the horses had belonged to the Aga Khan. Louis B. Mayer bought four of the horses, Charles S. Howard bought two, and Neil S. McCarthy and a Gordon Douglas of Wall Street each bought one.[30]
In June 1940 Britannic's westbound passengers included the Earl and Countess of Athlone, who disembarked at Halifax, Nova Scotia as the Earl had just been appointed Governor General of Canada. On the same voyage Jan Masaryk, who had been Czechoslovak ambassador to the UK and was about to become Foreign Minister of the Czechoslovak government-in-exile, travelled to New York.[35]
On an eastbound voyage in summer 1940 Britannic carried "hundreds" of obsolescent French 75mm field guns to the UK, to reinforce defence against the threat of German invasion. One of her officers later recalled that they were stowed on her promenade deck.[36]
In July Britannic's took Noël Coward to New York. He said the UK Minister of Information, Duff Cooper, had sent him to meet Lord Halifax, the UK ambassador in Washington.[37] In fact he was working for the UK Secret Intelligence Service to influence public opinion in the then-neutral US to support the Allied war effort.
Troop ship
On 23 August 1940 Britannic was requisitioned again. She sailed via South Africa to Suez and back, then to Suez again in 1941, and thence to Bombay again and back via Cape Town to the Firth of Clyde, where she arrived on 5 May. She then made one round trip to New York via Halifax before leaving the Clyde on 2 August for Bombay and Colombo via South Africa. Her return voyage was via Cape Town and Trinidad, arriving in Liverpool on 29 November 1941.[31]
In 1942 Britannic made two more round trips between Britain and Bombay via South Africa. From November 1942 she made two round trips between Britain and South Africa.[31] Her capacity was increased from 3,000 to 5,000 troops. In June 1943 she took troops to Algiers in Convoy KMF 17, and then went via Gibraltar and South Africa to Bombay, arriving on 10 September. From Bombay she sailed through the Suez Canal to Augusta, Sicily, and then returned to Liverpool, where she arrived on 5 November 1943.[31]