In the next mission, Thrall is still waiting for the Prophet to show up. But there are human around. Although the Orcs and Human are not in war now, there are groups which are hostile. Thrall need to establish a base and make way trough the bridge. All heroes have 6 inventory slots, and Thrall now have a Ring of Protection +1, which gives him +1 armor while he carries it. In Warcraft 3 we can select up to 12 units in a group, and number the group by pressing alt+1. Then pressing 1, the group will be selected.