Hereof, what happened to the Iron Legion?
The first Legion was destroyed by Stark after the Battle on the Norco so he could show how much he loved Pepper Potts. The second was made sometime before the War on HYDRA, consisting of droids; however, they too were destroyed during the Ultron Offensive.
Furthermore, why does Captain America call Thor the legionnaire? He didn't refer to Thor as the Legionnaire. He was referring to the rogue robot that took Loki's scepter while they battled the 1st incarnation of Ultron in Avengers Tower. If you recall, Thor took off after it.
Similarly one may ask, how many suits are in the Iron Legion?
There were originally thirty-five armors in the Iron Legion.
How many Iron Man suits are there?
49 Iron Man suits