Throughout the 1920s, the Vimy formed the main heavy bomber force of the RAF; for some years, it was the only twin-engine bomber to be stationed at bases in Britain. On 1 April 1924, No. 9 Squadron and No. 58 Squadron, equipped with the Vimy, stood up, tripling the home-based heavy bomber force. On 1 July 1923, a newly formed Night Flying Flight, based at RAF Biggin Hill, equipped with the Vimy, was formed; during the general strike of 1926, this unit performed aerial deliveries of the British Gazette newspaper throughout the country. Between 1921 and 1926, the type formed the backbone of the airmail service between Cairo and Baghdad. The Vimy served as a front line bomber in the Middle East and in the United Kingdom from 1919 until 1925, by which point it had been replaced by the newer Vickers Virginia.