Apocalypse: The Game of Nuclear Devastation (1974)

Originally self published by Mike Hayes in 1974 as "The Warlord". This edition came in a red box. It was reprinted by Mike in 1978 as "Warlord" and came in a blue box. It was released by Games Workshop in 1980 in a smaller version (only western half of the Warlord board) as "Apocalypse".

Objective - to dominate the board and destroy opponents.

Mechanics - similar to Risk, you get more armies for the more territories you hold.

Allocation is on basis of territory held, city, industrial, agricultural, mountainous and waste. Gaining territories is not like Risk. Instead of rolling dice you choose how many people you wish to attack with and your opponent must guess. If they do you lose them, if they do not they lose a piece - you then advance that number of men into the territory.
Alliances are allowed (and can be broken at will).

Nuclear devices are used in the game; you launch them to clear enemy territory and advance after them.