Final answer:
The clause "Suddenly the lieutenant cried out" from Stephen Crane's "An Episode of War" signifies a pivotal moment that changes the story's events.
Step-by-step explanation:
The clause that indicates a change in the story's events from "An Episode of War" by Stephen Crane is "Suddenly the lieutenant cried out".
This clause marks a shift from a methodical task of dividing coffee to an unexpected action that interrupts the lieutenant's concentration, suggesting a pivotal moment or alteration in the narrative.
This sort of shift often signifies a turn in the plot, transitioning from a state of normalcy to one involving conflict or surprise, which is a common literary device to keep the readers engaged and to advance the storyline.