The question below consists of a set of seven labelled sentences. They are all sentences of the same paragraph but their order has been jumbled. Sentence 1 and sentence 4 given below are the first and fourth sentences in the correct order. Arrange the other five sentences in their correct order to make a coherent paragraph and answer the questions that follow

1. With regard to defence, the purpose of the military is to defend the nation and be prepared to do battle with its enemy.

P. But in the industrial era, destroying the enemy's productive capacity means bombing the factories which are located in the cities.

Q. Now in the information era, destroying the enemy's productive capacity means destroying information infrastructure.

4. And depending upon the economic foundation, that productive capacity is different in each case.

R. How do you do battle with your enemy?

S. The idea is to destroy the enemy's productive capacity.

T. So in the agrarian era, if you need to destroy the enemy's productive capacity, what you want to do us burn his fields or if you're really vicious, salt them