The Bush War involved counter-insurgency operations by the Rhodesian Security Forces against two rival guerrilla armies, the Zimbabwe African National Liberation Army (ZANLA) attached to the Zimbabwe African National Union (ZANU), and the military wing of the Zimbabwe African People's Union (ZAPU), the Zimbabwe People's Revolutionary Army (ZIPRA). Following its reorganisation as a specialised commando unit starting in late 1964, the RLI played a major role in the war during its early phase, effectively countering ZANLA and ZIPRA incursions.