Back on the mainland, Amita sends you to destroy three artillery cannons before they can wipe Utkarsh off the map. The cannons are located in Kalesh, which would be a long drive in a straight line, let alone on twisting mountain roads. Take the nearby buzzer to make the trip more manageable. But park outside of town to the north, where the road forks.
Stealth is tricky here. Kalesh is practically a fortress. High walls, sniper towers, mounted guns. And only one road in. Moreover, the cannons all live ten feet from an alarm pole and a mounted gun. So the defenders here can hit back. Hard.
You have three viable options. Take the left fork, a narrow trail with a sniper-rific view of much of the town. Or stick with the right fork and charge up the main road while holding down the trigger. By now, you should have the skills and the weaponry to make either strategy look easy. Your third choice is to come up from the road to the west (look for a grapple just past the spot where the trail splits off to the south). From there, you can snipe or stealth your way to the southern cannon.
You actually can’t damage the cannons even with C4, so focus on wiping out the soldiers. Then wipe out any reinforcements who show up wondering why the alarms are blaring and the cannons have stopped firing.
Once you’ve completely cleared the town of enemy soldiers, you’ll need to meet a team of “sappers” at the gate. They’ll come in with several technicals full of troops in hot pursuit, so jump into the guard tower on the south side of the road and man the grenade launcher.
The Royal Guard isn’t done yet. Once you’ve grenaded the first wave of technicals, you’ll have only a few seconds to place mines in the road before reinforcements start rolling in. You’ll have to deal with a couple helicopters as well, but remember there are mounted guns beside every cannon.
Will nailing a heavy flamer in the fuel tank ever not be fun?
Above all, keep enemies away from the sappers, who abandon their task and scamper into cover at the slightest hint of danger, then have to start all over.
Once you’ve guarded the sappers through the demolition of all three artillery cannons (or set the explosives yourself because the sappers all got capped), the mission ends.