Orcs don't need no stinkin' guards!

That's because every orc is a guard in itself. Every man, woman, and child knows, can, and will drive a nasty looking weapon right through you, should you pose a threat to them. It's why two countries have to invade the orsimer in order to defeat them, for surely Orsinium could repel them alone.
Orcs are made of really tough stuff, and it's why I really like them.