Crossed Swords is the technical red teaming cyber defence exercise, training penetration testers, digital forensics professionals, situational awareness experts that fill the role of the attacking team at Locked Shields.

In 2018 Crossed Swords took place in Latvia in cooperation with CERT.LV, expanding considerably in scope and complexity, covering several geographical areas, involving critical information infrastructure providers and cyber-kinetic engagement of military units. For the first time several kinetic and cyber operations were carried out simultaneously in different geographical locations. In 2018 the exercise involved more than 80 participants from 15 countries.

NATO Cooperative Cyber Defence Centre of Excellence has been organising the exercise since 2016. The concept was initiated in 2014, when the first red teaming workshop was conducted.