Step 1: Understanding the Question:
The question asks to identify the two main characters mentioned in the passage.
Step 2: Locating the Information in the Passage:
- The first line of the passage identifies Amar Singh: "Once Amar Singh, the General of Shah Jahan's army, was passing..."
- A few lines later, Narshahwaj Khan identifies himself: "...I am a Pathan named Narshahwaj Khan."
Step 3: Final Answer:
Based on the text, Amar Singh was a General in Shah Jahan's army. Narshahwaj Khan was a Pathan whom Amar Singh found dying of thirst in the desert.