Webster’s Revised Unabridged Dictionary · 1913
Onslaught
On′slaught′ (ŏn′sla̤t′), n. [OE. on on + slaught, slaht, slaughter. See Slaughter.] 1. An attack; an onset; esp., a furious or murderous attack or assault.
By storm and onslaught to proceed. Hudibras.
2. A bloody fray or battle. [Scot.] Jamieson.