Onslaught is an arcade game released in 1989 by Hewson Consultants. The game was released for Amiga computers, Atari ST, PC (DOS) and Sega Genesis / Mega Drive.
In the game, you play as a warrior whose goal is to get as much territory as possible. To get a selected region, you have to go through several stages, including get a banner by going through the castle. Going through the castle you have to watch out for mines and hordes of warriors. Spells and weapons that you will get on the way to the banners will be helpful. If you manage to reach the end of the level, the next will be to fight the monster in the castle.