Because Artemas needs to sail on the ship to Spain to find to find Damon's father who is fighting in Caesar's army.
Explanation:
This question is about The Wadjet Eye by Jill Rubalcaba that is a story about Damon and Artemas, two characters that begin a journey from Egypt to Spain to find Damon's father who is a soldier in Caesar's army to tell him about his mother's death. Artemas doesn't mind having to clean latrines in order to sail on the ship because he and Damon need to go to Spain to look for Damon's father.
