Feudal
It's chess and battleship and Strageto and risk all in one game... sort of. Really. it's a bunch of plastic medieval warriors beating each other up to try to take the castle.
The map has mountains, rough terrain and field. Mountains are impassable, no horses on rough terrain and free movement on the field.
To learn the details of the game, check out the Wiki.
There are 8 different pieces, each with their own movement. There are not strengths, if you attack, you win. It's all about the strategy of using the unique movement of each unit and the terrain.
The King
The king can move one space in any direction. Like chess, you must protect the king. If you loose the king, prince duke and knight, you loose!
The Prince, Duke and Knight
The Prince
The Duke
The Knight
All three of these units can move unlimited number of spaces per turn, but cannot cross mountains or rough terrain. Lose these three units plus the king, game over you loose.
The Archer
Moves three spaces, but not diagonally. Attacks any unit within 3 spaces away.
The Sergeant
Moves 12 spaces diagonally only (!) or one space forward, back, left or right. Can cross rough terrain.
The Pikeman
Moves 12 spaces forward, back, left or right or one space diagonally. Can cross rough terrain.
The Squire
Moves 1 space horizontally or vertically followed by 1 space diagonally. Like the knight in chess.
Images are original and from the wikipedia page https://en.wikipedia.org/wiki/Feudal_(game)