To begin the mission, go down into the sewers and keep heading towards the marked spot.
That way you will reach an exit leading to the fort.
After getting outside, silently kill the closest guard and climb onto the building on the right.
The soldiers' reaction time is delayed, so you should have problems with escaping their sight.
As you reach the last building, jump down to the hay pile below and kill the nearby enemy.
There you will come across another enemy which you have to eliminate.
With him dead, climb onto the tower and light the signal fire.
After the explosion, head further a bit and you will have to fight with Haytham.
That way you will end the sequence.
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