‘P’ will be the first part of the given sequence as it begins with the word, ‘that’ which refers back to the given statement. ‘R’ will come next as it tells us about the quality of the soldiers talked about in ‘P’. ‘Q’ and ‘S’ will follow logically as they are used with conjunction, ‘not only – but’ which makes the sequence complete. Hence PRQS becomes the right sequence of words. Hence, option (d) is correct.