But not 200,000 man transports, lol.
I'm trying to think of precedents for naval invasions. Nothing's really coming to mind.... but that's telling. This would have been the largest transoceanic movement of troops... in history.
The Opium Wars, for example, had only about 20,000 British troops. The entire British (non-Indian) garrison of India was only about 60,000 soldiers. Moving 200,000 soldiers across an ocean like that at those tech levels is at the minimum ultra-expensive, but might be impossible.
Never claimed that any such movement of troops would all occur at once, or in a short time frame. Multiple trips would need to be taken, and it would be a large naval endeavor of course.
