Is this correct grammar?

'Thousands of whom' is the correct grammar.

:)

leave of whom out.

"The Wall was built by over one million peasants, prisoners and soldiers, thousands died in the process."

I believe the way it should go is this "The wall was built by over one million peasants, prisoners, and soliders; thousands of whom died in the process"

"The Wall was built by over one million peasants, prisoners, and soldiers; thousands of whom died in the process."

no, stop being stupid

"the wall was built by over 1 million peasants, prisoners, and soldiers who died in the process."

even a 4 year old could do that.

oh wait-

let me dumb down the sentence

"the wall was built."

understand it now?

The way you have it is correct. When you are talking about people, you say who or whom. When you are referring to anything else, you say that or which.

You're right, it's thousands of "whom", because you're referring to people.

It would be "which" if you were referring to something else. "Which" also includes animals as well as non-living things.

thousands of whom is correct

no ur right casue it is refering to a person or people "whom" do/did something

deffinatley "whom" :)