They began preparations to siege the castle.

They besieged the enemy's castle.

They were attacked from more than one side, and the situation of the battle changed drastically.

The enemy attacked us from more than one side.

The trailing edge of this airplane has a very unique shape.

After school, we study at the library.

He suffered a minor contusion on his occiput.

He sneaked into the school through the back gate.

He was unconsciously following the woman.

This word is used as a postposition.