Which island siege of Alexander took seven months?

The siege of Tyre was the island siege that took Alexander the Great seven months to complete. It lasted from January to July 332 BC during his campaign against the Persian Empire.

Tyre was a powerful Phoenician city built partly on a coastal island about one kilometre from the mainland. Its walls rose directly from the sea, making a conventional land assault nearly impossible. Alexander ordered his troops to build a massive causeway, or mole, from the mainland toward the island.

The Tyrians fiercely resisted, using ships, divers, fire attacks, and missiles to disrupt the construction. Alexander eventually brought in a large fleet from Cyprus and other Phoenician cities, gaining control of the surrounding waters. Siege towers and battering rams then helped breach the walls.

Tyre’s fall opened the eastern Mediterranean coast to Alexander. It is often confused with the sieges of Gaza and Halicarnassus, but neither was the famous seven-month island siege.