1 This can happen when the arteries to the heart become thicker and harder from a buildup of plaque. 2  High blood pressure causes scarred arteries that fill up with plaque and become more prone to blood clots.
To commandeer is to take possession or control of something, or to take control of something for a military or law-enforcement purpose, or to make someone help you.
In the armed forces, a command is a group of officers who are responsible for organizing and controlling part of an army, navy, or air force. He had authorisation from the military command to retaliate. The army's supreme command has said the army will withdraw, provided the other side does so also.