Indian army work except fighting a war

Firstly, the army's primary duty is not just to fight wars, but also to act as a deterrent. No country will dream of attacking someone with a strong army.
Anyway, the things an army does in time of peace 

1. TRAIN
   The more you sweat in peace, the less you bleed in war. Armyunits keep going through exercises in desert ares, jungle warfare, mountain warfare etc.
   We in fact, have among the best training schools for jungle warfare and mountain warfare.
   
   
2. Anti-insurgency -The army has a perpetual presence at borders to stop militants and other anti-national elements from sneaking into the country.
   This also ensures they are there if any enemy decides to attack.
3. Essential services
   The army provides various essential services as far as security and all are concerned. Ensure certain things like communication keep running smoothly.
   Sadly, in our country, the civilian governments are unable to handle a lot of things which actually fall outside the jurisdiction of the army, yet are done by the army!
   Examples - The foot over bridge which collapsed days before the Commonwealth Games were rebuilt by the army.
4. Research and development
   Whether it be of weapons or tactics. The army uses peace time to ensure it can use its resources in hand to maximum effect, by just experimenting!
   In the sense, whether a platoon should carry 1 machine gun or 4. Or whether Infantry and Armor should be used together. If yes, in what ratios? Things like that.
   
   
5. Infrastructure
   In forward areas, the army's job(in collaboration with other paramilitary forces) is to ensure things like bunkers and roads and airstrips are built and built properly.
6. Security
   The NSG is drawn from the armed forces. The Navy ensures ourmaritime trade routes are safe from pirate attacks. The army is called into riot hit areas to hold flag marches, to make people feel safer.
   
   
7. Diplomacy
   The armed forces have various war games and exercises with other countries, to increase diplomatic ties. This is also done a lot by the navy.
   
   
   
   
   
8. 
   
   Participation is Peace-Keeping operations of the UN
   India has assisted the United Nations in peace-keeping operations in various countries. We regularly send a lot of soldiers to the UN. Recently, examples of service are in South Sudan.
   
   
   
9. 
   Disaster Management and relief work
   The Army is regularly involved on relief work in times of disasters like floods, earthquakes, tsunamis etc.
   This was seen recently in Uttarakhand where the Army saved a large number of civilians and was instrumental in bringing the area to normalcy.
   
   

However, the main duty of the army is still to serve as a deterrent to any hostile country which decides it wants to take pangas!