 After the death of the King at the Battle of Sauchieburn and the coronation of his underage son James IV he raised an army to fight against the rebel lords who now controlled the government.The rebels had seized control of Edinburgh Castle and now had possession of the important royal artillery.Included in the arsenal of Edinburgh Castle was the cannon Mons Meg which had been a wedding gift from Philip the Good, Duke of Burgundy to the King of Scots a generation earlier.