The situation changed suddenly after the end of Portuguese colonial rule in Mozambique in 1975. Rhodesia now found itself almost entirely surrounded by hostile states and even South Africa, its only real ally, was pressing for a settlement. The Rhodesian Bush War intensified during this period. There were 2,504 vehicle detonations of land mines (mainly Soviet TM46s), killing 632 people and injuring 4,410. The new Mozambican government threw its full weight behind the ZANLA cause and Rhodesia's entire border with Mozambique became a front line across which guerrillas began to operate freely. Zambia became another front which was opened when the Zambian government also gave sanctuary to the guerrillas.