Here's a short story:

Chapter 13: The Final Advance. 

A few days after the return of headquarters to Berber, Mahmud was sent down country, and Fatma was permitted to accompany him. She expressed to Gregory, in touching terms, her gratitude for what he had done for her. 

"We have been of mutual assistance," said Gregory. "I have the same reason to be grateful to you, as you have to thank me. I saved your life, and you saved mine. You were very kind to me, when I was a captive--I have done as much as I could for you, since you have been with us. So we are quits. I hope you will be happy with Mahmud. We do not treat our prisoners badly, and except that he will be away from the Soudan, he will probably be more comfortable than he has ever been in his life." 

Gregory was now employed in the transport department, and journeyed backwards and forwards, with large convoys of camels, to the head of the railway. The line was completed to Berber, but the officers charged with its construction were indefatigable; and, as fast as the materials came up, it was pushed on towards the Atbara. Complete as had been the victory on that river, the Sirdar saw that the force which had been sufficient to defeat the twenty thousand men, under Mahmud, was not sufficiently strong for the more onerous task of coping with three times that number, fighting under the eye of the Khalifa, and certain to consist of his best and bravest troops. He therefore telegraphed home for another British brigade, and additional artillery, with at least one regiment of cavalry--an arm in which the Egyptian Army was weak.  (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Who was Fatma grateful for?
Guess: Gregory

Question: Were her feelings reciprocated?
Guess: yes

Question: Where had they returned to?
Guess: Berber

Question: Who was Fatma to travel with?
Guess: Mahmud

Now answer the following question in the same format.

Question: Why were the two with Gregory?

he was employed in the transport department