There are many possibilities:
My sister was the victim of an Onslaught of water balloons The Incas were overcome by the Spanish conquistadors' onslaught.
The castle was unable to defend against the marauders' onslaught. I am expecting a veritable onslaught of butterflies, this spring.
"He was overpowered by the merciless onslaught."
Onslaught - Transformers - was created in 1987.
Onslaught - comics - was created in 1996.
Onslaught - novel - was created in 2002.
Onslaught - band - was created in 1983.
Total Onslaught - 2004 1844 and the Final Onslaught 1-32 was released on: USA: 2004
The onslaught of the Black Death is difficult to suppress.
Onslaught - Dove - was created on 2007-10-01.
A violent attack.An overwhelming outpouring: an onslaught of third-class mail.
The attacking army's onslaught continued until the defending army was defeated.