Onslaught is a video game that was released by Hewson in 1989 for the Amiga and subsequently ported to the Atari ST, MS-DOS, and Mega Drive.

However, even the mightiest army fears a 'fanatic', a solitary warrior who lives to fight and conquer and is remembered according to the number of his victories and the greatness of his deeds.

Defeat the ravaging hordes of monsters, conquer the world and bring peace to the warring kingdoms.

Good luck – it won't be easy!Gameplay takes place in three sections.

First, a territory to attack is selected from the campaign screen; next the player is taken to the territory, where he battles through hordes of themed aggressors on a side-scrolling landscape to reach a castle, which he must also conquer; finally the player faces the master of the castle – a wizard with four spell-casting tentacle arms – whom he must defeat by firing magic at him whilst avoiding the spells that the wizard fires back.