host of the west

As the three friends entered Mordor, an uncomfortable feeling passed through them, but they all ignored it. They kept moving through Cirith Gorgor, defeating any orcs in their path, and they passed through Carach Angren. If they all weren't immune to fear, a wave of dread would have taken over their minds - but with the presence of two Eldar, the shadow of Mordor was nothing to them.

And so did Aragorn son of Arathorn gather as many soldiers as possible to come with him to the Black Gate of Mordor and fight one last time against the Host of Mordor. The two friends, Ornessar and Katrandil, joined him too. 

There, they met a defiled Númenórean, called "The Mouth of Sauron", who conversed with Aragorn. This event started the battle. The Black Gate opened, and Aragorn turned towards his allies.