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When tossing grenades into fireing points and onto battlements when assaulting a building, do you need to roll to hit, or are they assumed to be autohits since building is ws 0?

My opponent argued that you would need some skill to hit the fireing slits or toss a nice arc onto the roof, so I rolled to hit the last game I played, But rereading the rules today im not so sure anymore. What do you guys think?

It is a close combat attack, not a shooting attack.

As Nosferatu said, it's a close combat attack. Relevant rules:

Grenades against buildings, page 94 5th topic, "Grenades" and

Grenades against battlements, page 96 under "Assaulting the Battlements".