NDA English Rearranging Sentences in a Paragraph

S1: The Subsidiary Alliance system was extremely advantageous to the British.
S6: They controlled the defence and the foreign relations of the protected ally.
P : They could now maintain a large army at the cost of Indian states
Q : if any war occurred in the territories.
R : either of the British ally or of the Britishers
S : This enabled them to fight wars far away from their own territories
The proper sequence should be