Some Australians decided to delay their departure and instead joined the British Army and went on to serve in Northern Russia during the Russian Civil War, although officially the Australian government refused to contribute forces to the campaign. HMAS "Yarra", "Torrens", "Swan" and "Parramatta" served in the Black Sea during the same conflict. Elsewhere, in Egypt in early 1919, a number of Australian light horse units were used to quell a nationalist uprising while they were waiting for passage back to Australia. Despite shortages in shipping, the process of returning the soldiers to Australia was completed faster than expected and by September 1919 there were 10,000 men still left in Britain waiting for repatriation. The last of the main transports conveying Australian troops left England on 23 December 1919, arriving in Australia in early 1920. A year later, on 1 April 1921, the AIF was officially disbanded.