Worshipper – “Conquest” [Campaign 2, Mission 3]

If you have version 1.0, install patch 1.4, 1.5, or 1.6 – it will be much easier. However, after 1.5 or 1.6, to avoid glitches in campaigns 3 and 6, it is recommended to replay them. And for 1.6, you also need a small bug-fixing patch.