QUES:
Who is it in the following sentence?

The army crossed the river because it was retreating.

ANS:
The army

QUES:
Who is he in the following sentence?

Merchant Smith purchased the trophy from Knight Louis, but he did not pay very well for it.

ANS:
Merchant Smith

QUES:
Who is he in the following sentence?

Ryan has much less hair than Gary, so he does not go out in public without a hat.

ANS:
Ryan