Culled from here:
Assyrian Period Fortifications Unearthed in Ashdod 18 ft. high fortifications dating back to the 8th century BCE were discovered in the harbor of the ancient Philistine city.
...[a] more recent dig [at Tel Ashdod Yam] has brought to light the remains of an 8th century BCE fortification system – a mud brick wall comprised of internal and external dykes circling a wharf. The dig has also unearthed ruins of buildings from the Hellenistic period (late 4th to early 2nd centuries BCE), as well
as coins and weights.
...[the] team was surprised by the degree of preservation of these structures, from some 2,750 years ago. They’reonly now beginning to come to terms with the magnitude of what they’ve discovered...Assyrian texts do describe a Philistine rebellion against Assyrian rule at the end of that period. Dr. Fantalkin believes the fortifications he discovered are related, one way or another, to the events on record.
...Following the Philistine rebellion, the Assyrians sent down an army in 712 BCE, and the rebelling king fled to Egypt,” he continued. “The Assyrians demanded the Egyption extradite him, which they did. The entire affair is mentioned both in the Bible and in Assyrian sources. (For Gaza will be abandoned And Ashkelon a desolation; Ashdod will be driven out at noon And Ekron will be uprooted. Zephaniah 2:4) The rebellion was put down forcefully by the Assyrians and the city of Ashdod was destroyed.”