I can't comment if it has happened in Canada or not. You would need to ask the military if there have been any attacks on military infrastructure. It's often difficult to determine. With critical infrastructure, much of it is dual use. If it targets explicitly military infrastructure, I would consider that an attack on the military, but I would say that there needs to be another bill to address cyber-defence in the armed forces and CSE. There particularly needs to be a formal force and command structure that organizes CSE and the military, as it currently doesn't exist. It's very ad hoc.
On February 10th, 2023. See this statement in context.