Question: what was the first port used by Australian Commonwealth Horse

Context paragraphs:
Australian Commonwealth Horse: The Australian Commonwealth Horse (ACH) was a mounted infantry unit of the Australian Army formed for service during the Second Boer War in South Africa in 1902 and was the first expeditionary military unit established by the newly formed Commonwealth of Australia following Federation in 1901.  Over 4,400 men enlisted in the ACH in three contingents, with troops and squadrons raised in each state and combined to form battalions. Eight battalions were raised, with the first arriving in Durban in March 1902.  The 1st and 2nd battalions saw limited active service, conducting patrols against the Boers during the last great drives that ultimately ended the war.  The war ended before the remaining battalions arrived to see action, and by the time peace came on 31 May 1902, the majority of the third contingent, consisting of the 5th, 6th, 7th and 8th Battalions, still remained at sea bound for South Africa.  The ACH suffered no fatal casualties in action, although 28 men died from illness.

Nigel Nutt: Nigel Robert Forbes Nutt (born 26 March 1966) is an Australian Commonwealth fencer and engineer.  Originally from Sydney, Nutt attended Barker College and later succeeded in a degree for engineering at Oxford University.  In 1990, Nutt fenced in the Commonwealth Fencing Championships held in Manchester, England, and finished in the top 30.  Later the same year, Nutt fenced in the World Cup - Challenge Brut held in Paris, France and finished in the top 60 of the world.  Nutt has achieved the rank of Gold (top 8) in the Australian Commonwealth Fencing Championships, the Commonwealth Veteran Fencing Championships, the Australian Open, and numerous other fencing Opens such as the Scottish Open, Bristol Open and the New Zealand Open.

Commonwealth Games Australia: Commonwealth Games Australia (CGA), formerly Australian Commonwealth Games Association (ACGA), is the Commonwealth Games Association for Australia.  It represents the Commonwealth Games movement and organises the participation of athletes at the Commonwealth Games and Commonwealth Youth Games.

Thomas Collins (Australian politician): Thomas Joseph "Tom" Collins (6 April 1884 – 15 April 1945) was an Australian politician and stock and station agent, born at Yass, New South Wales to storekeeper John Collins and Mary, née Hartigan.  In 1902, having attended the local Catholic school, he enlisted in the 5th Battalion, Australian Commonwealth Horse, to fight in the Boer War.  However, by the time Collins's unit arrived, the war had finished.

Johor Port: The Johor Port (Malay: "Pelabuhan Johor" ) is a port located at Pasir Gudang, Johor Bahru District, Johor, Malaysia.  Built by the Johor Port Authority and run by Johor Port Berhad in 1977, it is the first port in Johor and is designed as a multi-purpose port that caters to practically all types of cargo.  It is the first port in Malaysia to be located within a free trade zone.  Johor Port's warehouses are exempted from customs duties.  Duty is only payable when the cargo is released from the warehouse area for local consumption.

Ennore Port: Ennore Port, officially renamed Kamarajar Port Limited, is located on the Coromandel Coast about 24 km north of Chennai Port, Chennai, it is the 12th major port of India, and the first port in India which is a public company.  The Kamarajar Port Limited is the only corporatised major port and is registered as a company.  The Centre holds a stake of about 68 per cent in the Kamarajar Port Limited and the remaining 32 per cent is held by the Chennai Port Trust.  The port has been able to attract an investment of 26,000 million by private entrepreneurs on various terminals and harbour craft.  Kamarajar Port Limited, designed as Asia's energy port, is the first corporatised port in India and has only 86 employees.  Envisaged being a satellite port to decongest and improve the environmental quality at the bustling Chennai Port, Kamarajar Port Limited is evolving itself into a full-fledged port with the capacity to handle a wide range of products.  With a permissible draught of 13.5 m, the port handled a total volume of 11.01 million tonnes in 2010–11, up by 2.86 per cent from the previous year.

Royal Australian Army Medical Corps: The Royal Australian Army Medical Corps (RAAMC) is the branch of the Australian Army responsible for providing medical care to Army personnel.  The AAMC was formed in 1902 through the amalgamation of medical units of the various Australian colonies and was first deployed to South Africa as a small detachment of personnel supporting the Australian Commonwealth Horse during the Second Boer War.  Since then the corps has participated in every Australian Army operation since then including wars and peacekeeping operations.  The "Royal" prefix was granted in 1948.

Port of Ghent: The port of Ghent is the third biggest port in Belgium.  The first port of Ghent was situated at the Scheldt river and later on at the Lys river.  Since the Middle Ages Ghent has sought for a connection to the sea.  In the 13th century via the Lieve canal to the Zwin near Damme, in the 16th century via the Sassevaart, in the 17th century via the Ghent-Bruges Canal.  Since the 19th century by the Ghent-Terneuzen Canal which connects via the Western Scheldt to the North Sea.  The port of Ghent is accessible by ships of the Panamax size, and in February 2015 the construction of a new lock at Terneuzen was announced, which will maintain near-parity with those of the Panama Canal expansion project.

Port Pipavav: Port Pipavav, India’s first port in the private sector, is a port on the West Coast of India for containers, bulk and liquid cargo.  Its lead promoter is APM Terminals, one of the largest container terminal operators in the world.  The services include pilotage/towage, cargo handling and logistics support.  Port Pipavav is located in Saurashtra, Gujarat, at a distance of 90 km South of Amreli, 15 km South of Rajula and 140 km South West of Bhavnagar.

Durban: Durban (Zulu: "eThekwini" , from "itheku" meaning "bay/lagoon") is the largest city in the South African province of KwaZulu-Natal.  Durban's metropolitan municipality ranks third among the most populous urban areas in South Africa after Johannesburg and Cape Town.  It is also the second most important manufacturing hub in South Africa after Johannesburg.  It forms part of the eThekwini Metropolitan Municipality.  Durban is famous for being the busiest port in South Africa.  It is also seen as one of the major centres of tourism because of the city's warm subtropical climate and extensive beaches.  The municipality, which includes neighbouring towns, has a population of almost 3.5 million, making the combined municipality one of the biggest cities on the Indian Ocean coast of the African continent.  It is the largest city in KwaZulu-Natal which is the 2nd most populous province in South Africa.  It has the highest number of dollar millionaires added per year of any South African city with the number rising 200 per cent between 2000 and 2014.  In May 2015, Durban was officially recognised as one of the New7Wonders Cities together with Vigan, Doha, La Paz, Havana, Beirut, and Kuala Lumpur.

Supporting paragraphs: Australian Commonwealth Horse Durban
Answer: the busiest port in South Africa