on guard in a sentence

Examples

1. He said there were 1, 200 security personnel on guard.
2. That night, Roic is on guard when Taura joins him.
3. I can't be spending this much on guards every month.
4. Soldiers were on guard in some areas to prevent looting.
5. Airlines and mail services remained on guard Friday in California.
6. Mentally, it seems Glaus is always on guard for that.
7. Manning wasn't supposed to be on guard for that play.
8. We have physical feelings, and have to be on guard.
9. They were on guard for intrusions from the news media.
10. Still, Nighthawk has been on guard since Sept . 11.