Crusader-era siege ramp protected Israeli city from the desert for a thousand years

Israeli archaeologist identifies massive siege ramp erected by Muslim or Christian warriors to conquer Ashkelon – which has been shielding the city from encroaching sand dunes ever since https://www.haaretz.com/israel-news/crusader-era-siege-ramp-protecting-israeli-city-from-the-desert-1.9421886 #israel_archaeology