Rearrange the following into correct sentence:
The captain
(P) when engaged against the enemy
(Q) who was himself a brave man
(R) never to lose heart
(S) advised the soldiers

QSRP

The correct answer is option 3. QSRP

The captain who was himself a brave man advised the soldiers never to lose heart when engaged against the enemy.

Let us break down the arrangement "QSRP":

Q: This begins the sentence by introducing the subject, the captain, and providing additional information about his character - "who was himself a brave man."

S: Following "Q," this segment describes the action taken by the captain - "advised the soldiers."

R: Next, "R" specifies the advice given by the captain - "never to lose heart."

P: Finally, "P" concludes the sentence by adding context to the captain's advice - "when engaged against the enemy."

So, when arranged as "QSRP," the sentence flows logically from introducing the captain and his bravery to describing his advice to the soldiers and the context in which it was given.