Bath's greatest achievement in coaching the national side was leading the Kangaroos to World Cup glory in the 1968 and 1970 World Cups. He also coached the team on tours of New Zealand in 1969 and 1971. He coached the national side in the 1972 World Cup in which they lost to Great Britain in controversial circumstances. The World Cup Final was tied at 10–10 after full-time and was still locked after extra time. Great Britain were awarded the victory due to a higher points table placing after the pool rounds of the competition.