A siege is the act or process of surrounding and attacking a fortified place in such a way as to isolate it from help and supplies, But inevitably the attackers almost always win the siege and capture the land. In case you were wondering why someone would want to do this, the reason is they want more. More of everything,land, farms, fields, and mines.
The Trebuchet was a valuable medieval siege weapon, similar to a catapult, which was used for hurling heavy stones to smash enemy castles or city walls. This weapon was invented around the year 1200 ad by a french engineer.