Pardon, but where were you? H CoS normally refers to Heroic Culling of Stratholme.
The only alternative I could guess is Trial of the Crusader, for which there is no heroic version yet... further the number of players in the raid (10 or 25 man) and the boss you were experiencing troubles with would be hugely helpful in evaluating your situation.
An armory profile link would also help.
You can't provide too much information.
To answer your question in a broader sense... warriors can tank every encounter in the game.