Cape Town is the capital city of South Africa. It was a final stand between the Global Defense Initiative and the Brotherhood of Nod as they controlled all of Africa from top to bottom, while GDI was to destroy Kane's headquarters at Sarajevo where he had turned Central and Eastern Europe into a war zone plus being responsible for the Bialystok scandal in Poland.
First Tiberium War
When the Brotherhood of Nod fought against rogue General, Nikoomba in Libya, the Global Defense Initiative sent peacekeeping forces by the orders of Robert Fielding, Honore Prichard and Francis Weatherell in a bid to help African leaders overwhelm the Brotherhood of Nod and gain more footholds to stop Nod in its tracks. Both Fielding and Weatherell took the GDI bases in Egypt, Sudan, Mauritania, Nigeria, Zaire, Tunisia, Tanzania, Namibia, Botswana, Zambia, Zimbabwe and South Africa. Prichard only took the GDI bases in the Ivory Coast, Zaire, Benin, Chad, Angola and Mozambique.
GDI's End in Africa
The Nod forces fought against GDI to control Africa and using the hijacked Ion Cannon to destroy a major site. The Nod arsenal destroyed GDI forces coming through the city and within the base of operations before a new Temple of Nod was built to launch Nuclear Missiles against their common enemy with two bases destroyed earlier and later, a third one killing the GDI Commander in charge for the city before the rest of Nod's finest Commanders including the Nod Commander himself had destroyed the final three killing the GDI South African Commander and capturing the city, causing a surrender by the President of South Africa.
U.S. President Robert Fielding was at Camp David when the White House was destroyed by the hijacked Ion Cannon strike and Parliament House in London was destroyed with Francis Weatherell being at Chequers. The other two choices were both the Paris Tower and Brandenburg Gate.