"Mozambique's president, Samora Machel, had declared 'a state of war' with Rhodesia"
Samora Machel
Creative Commons Attribution Share AlikeSamora Machel - Credit: Hubert Link

Mozambique had not actually declared war.  President Samora Machel's words were "Our country has been attacked and our people are being massacred. We are in a state of war."  But this subtle distinction was lost in an early translation that spoke of a "declaration of war".  The 800-mile border between Mozambique and Rhodesia was closed, and Mozambique began fully to implement the UN-imposed international sanctions against Rhodesia.

TIME magazine, March 1976: AFRICA: The Countdown for Rhodesia

The UK's Daily Mail said: The choice for the Europeans in Rhodesia is not between handing over and hanging on. It is between a chance of survival and certain suicide.