The siege of Burgos was one of the last military engagements that saw the use of trebuchets , as gunpowder weaponry such as cannons became increasingly common .
The siege is one of the last known references to their use .
The siege of Burgos was one of the last military engagements that saw the use of trebuchets , as gunpowder weaponry such as cannons became increasingly common , and the siege is one of the last known references to their use .