An army officer told newsmen the rebels hurled grenades and fired automatic rifles as they tried to enter an artillery unit of the camp in the Uri region before dawn, officials said.
The sprawling camp, also the regional headquarters of the army’s artillery regiment, is near the heavily militarised line of control.
Eight soldiers including a lieutenant colonel and three policemen were killed on the Indian side, police said. The officials spoke on condition of anonymity as they were not authorised to speak to media.
The attackers struck days before Prime Minister Narendra Modi was due to visit Indian-Occupied Kashmir, where thousands of extra paramilitary troops have been deployed for month-long local polls.