At Dragonstone, Daenerys Targaryen holds a war council with her allies: Olenna Tyrell, Ellaria Sand, and the Greyjoy siblings. Tyrion Lannister proposes a strategy to avoid being seen as a "foreign invader":
Westerosi forces (Tyrells and Dornish) will surround the capital to starve it out. Game of Thrones Season 7 - Episode 2
The Unsullied will sail around the continent to seize the Lannister ancestral home. At Dragonstone, Daenerys Targaryen holds a war council