Answer:
C. The troops had no rest, but had to return to the fight in the field.
Step-by-step explanation:
The most accurate paraphrase for the sentence is "the troops had no rest, but had to return to the fight in the field."
The option is accurate because it still gives the basic information that the main sentence gave.
Words like "respite" means "rest", "fracas" is synonymous to "fight" and "sward" is synonymous to "field". The option still retains the basic information; therefore, it's the most accurate.