The knights of the First Crusade laid siege to the city of Alexandretta for over a year....

Indiana Jones: The knights of the First Crusade laid siege to the city of Alexandretta for over a year. The entire city was destroyed. The present city of Iskenderun is built on its ruins. Marcus, you remember what the Grail tablet said, "Across the desert and through the mountain to the Canyon of the Crescent Moon." But where exactly? Marcus Brody: Your father would know. [a thought strikes him] Marcus Brody: Your father did know. Look. He made a map. [opening the diary] Marcus Brody: He must have pieced it together from clues scattered the whole history of the Grail quest. A map with no names. Now, he knew there was a city with an oasis due east, here. He knew the course turned south through the desert to a river, and the river led into the mountains, here. Straight to the canyon. He knew everything except where to begin, the name of the city. Indiana Jones: Alexandretta. Now we know. Marcus Brody: Yes. Now we know. Indiana Jones: Marcus, get hold of Sallah. Tell him to meet you in Iskenderun. Marcus Brody: What about you? Indiana Jones: I'm going after dad.