Tyre (and Sidon) were powerful cities in ancient times. Alexander The Great sent a herald to the city asking to worship at the city’s shrine to Heracles.
The Tyrenians told him there was a perfectly good temple on the mainland (Tyre was located on an island). Alexander sent another herald and the citizens of Tyre butchered him on the wall within sight of the Macedonian Army. They thought their city was unconquerable because of it’s location and high walls.
Alexander built a causeway all the way to the island. The Tyrenians came close to stopping Alexander several times but he kept at it and eventually stormed the walls and destroyed the city.
They should have let him worship. Today Tyre is no longer an island as the causeway caused the area to silt up.
Thanks for that info. After reading a bit I found you can see the remnants of the causeway on google maps, a long linear feature just to the north of the Roman stadium ruins.