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The castle was unable to defend against the marauders' onslaught.
I am expecting a veritable onslaught of butterflies, this spring.
My sister was the victim of an Onslaught of water balloons
The Incas were overcome by the Spanish conquistadors' onslaught.
"He was overpowered by the merciless onslaught."
Onslaught - Transformers - was created in 1987.