As of the end of season 6 of Game of Thrones, Queen Daenerys is leading the much awaited invasion of Westeros. Her fleet on the screen is impressive, covering the sea to the horizon, not to mention sailing under three enormous dragons.
I'm curious of the number and the composition of the invading army. This is what I know so far:
Unsullied: She acquired 8000 of them from Kraznys the slaver (S3E04). Luckily, the Unsullied did not have to fight in Yunkai, or Meereen, as they were brought under control without large battles. But, a considerable number of them must have died because of uprising of the Sons of the Harpy and the Battle of Meereen. How many of the 8000 remain now?
Second Sons: When the sellsword company offers their allegiance, they were 2000 strong. Were there any deaths in Meereen because of Sons of the Harpy and the Battle of Meereen? Is the company still intact? (In the books, some of them switch sides and side with the slavers).The Second Sons stay in Meereen, as comments have pointed out.
Dothraki Screamers: After killing all the former Khals at Khalar Vezhven, she leads a large population of the Dothraki race. How many fighting Dothraki men serve her? Do we have an estimate?
The Iron Fleet: Yara and Theon brought a large number of ships and men to sail them. Do we have an estimate on the number of men/ships?
Slaver's Navy: Did any of the Navy enter Queen's service after the Battle of Meereen? Do we have an estimate on how many ships/men she has?
Various companies unspecified in the show (?): In the books we have Brazen Beasts, Mother's Men, Free Brothers, Stalwart Shields, and Stormcrows. None of these entities are mentioned in TV show, as far as I remember. Or am I wrong?
Martells and Tyrells: Many viewers spotted the Martell and Tyrell sails in Queen's fleet. But we can safely assume that they were only delegates. The Southern houses would be fools to transport an army to Meereen and back for no reason.
Putting aside possible Westerosi armies who would join her later, who else is in Queen Daenerys's conquering army and what are their numbers?