For so long, England have set the standard in women's international rugby.
However, their recent results against Canada suggest the gap between the Red Roses and the chasing nations is beginning to close.
England made a strong start to their WXV Global Series campaign, recording an impressive 48-15 victory over Australia despite trailing narrowly at half-time.
They followed that with a 26-26 draw against Canada at Sandy Park in Exeter before edging a nervy return encounter 26-19 against New Zealand, thanks to a late try from Zoe Harrison.
However, recently, their form has dipped. Canada secured a 24-21 victory over England in Toronto before following it up with a 31-22 win in Ottawa, handing the Red Roses consecutive defeats and raising questions about their recent dominance.
While England have continued to demonstrate their attacking quality and ability to compete with the world's best, the two defeats against Canada have exposed defensive vulnerabilities and highlighted areas that need attention.
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For a side accustomed to setting the pace, the results are a reminder that England can no longer simply win by just turning up with their reputation and superior squad depth. They will need to find solutions if they are to maintain their position at the top of the international game.
It would be unfair, though, to focus entirely on England's shortcomings without recognising just how impressive Canada have been.
Their rise has been building for some time, and their performances have demonstrated how much the international women's game has developed. Canada matched England physically, defended with real intensity and showed confidence in their attacking ability.
Rather than trying to contain the Red Roses, they took the game to them and exposed weaknesses that other teams have previously struggled to exploit.
Their success also underlines the increasing competitiveness of women's rugby. More nations are investing in their programmes, developing their tactical approaches and producing players capable of competing at the highest level.
That is exactly what the international game needs. A more competitive landscape creates greater uncertainty, raises standards and makes matches between the leading nations increasingly difficult to predict. Canada have shown they are no longer simply chasing England. They can beat them.
England's next challenge comes against a USA side that will be full of confidence after winning all four of their WXV Global Series matches so far.
The USA Women's Eagles will relish the opportunity to test themselves against the Red Roses.
They began their tournament with an impressive 40-36 victory over Ireland in Dublin before edging a close encounter against Wales in Cardiff, winning 26-24.
Back on home soil, they continued their winning run with a 36-27 victory over Italy in Texas before producing an emphatic 54-24 win against the same opposition in Nashville.
With four wins from four under head coach Jack Hanratty, the Eagles head into their final fixture with plenty of confidence. They have demonstrated they can play with ball in hand, and pose a significant attacking threat against established international opposition.
The Red Roses have the quality and experience to cause the USA plenty of problems, particularly through their dominant forward pack and powerful set piece.
If they can get their attacking play right, they have the quality to exploit the USA out wide, and if they can win the battle at the breakdown and use their backs smartly, England will put pressure on their hosts.
England head coach John Mitchell has made six changes to the starting XV for tonight's encounter, with Flo Robinson set to earn her first international start.
Robinson will link up with Exeter Chiefs team-mate Claudia Moloney-MacDonald, who returns to the wing, while Sale Sharks fly-half Holly Aitchison also comes into the starting line-up.
Tatyana Heard, who also plays for Sale, completes the changes in the backline.
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There are two changes in the front row, with Gloucester-Hartpury duo Mackenzie Carson and Maud Muir coming into the pack.
With both sides having plenty to prove, it promises to be an intriguing contest and an important test of where England find themselves after their recent setbacks against Canada.
England: Sing; Venner, Jones, Heard, Moloney-MacDonald; Aitchison, Robinson; Carson, Cokayne, Muir, Talling, Ives Campion, Burton, Kabeya, Feaunati
Replacements: Field, Botterman, Bern, Short, Matthews, Hunt, Harrison, Kildunne