The Pretoria Forts consisted mainly of four forts built by the government of the South African Republic (ZAR) just before the outbreak of the Second Anglo-Boer War around the capital of Pretoria.After the abortive Jameson Raid, the government of the ZAR became concerned about the safety of its capital city, Pretoria, both from foreign invasion as well as from the growing number of Uitlanders (Foreigners) on the Witwatersrand.Consequently, a defence plan for Pretoria was drawn up by a former French artillery officer, Leon Grunberg.