Onslaught were formed in 1982/83 in Bristol, England by guitarist Nige Rockett. vocalist Jase Pope and Bassist Paul Hill and soon after to be joined by drummer Steve Grice. a demo was recorded and released later that year by this line up.
Jase Pope and Paul Hill were soon to be replaced by Roge Davies and Paul Davis respectively. The subsequent line-up recorded an EP, What Lies Ahead, in 1983.
In 1984, Paul Mahoney and Jase Stallard replaced Roge Davies and Paul Davis respectively.