from the article
On the night of Nov 26, 2008, Lashkar-e-Tayiba David Coleman Headley was at home in Lahore when his handler Sajid Mir sent him a text message. It said, "Turn on your television."
The siege of Mumbai lasted three excruciating days. The 10-man attack team arrived by sea, landing at a fishermen's slum chosen by Headley for its strategic location. The young gunmen had never been to India. They were guided by Headley's videos and written reports, his provision of GPS coordinates and his work with a Pakistani navy frogman on the maritime approach.