they do get stealth at higher rank. I can think of at least two nice caves to lurk in.

If you run a search for

orc

by name of poster, most of those are orc wins. The log of Gnarsh losing his flag shows an orc winning until he gets slept, which happened largely because he made a mistake and spinebroke instead of bashed again.

Thinking some more about orcs, they are pretty much safe from bleeding and poison too. Even crimson scourge. All they need to do is be able to see their bloody skins and have saved their strength in case they need to force march.