Practical Methods for Assessing Your External Attack Surface 22 March 2022·2271 words·11 mins by: Juhani Eronen The siege of Château Gaillard between September 1203 and March 1204 is a good example of determined attackers exploiting a weakness in the defenders’ threat model. As the story has it, a French soldier clambered up the latrine chute and let in his compatriots to take over the castle.